DNA function

How does DNA function and how is DNA structured

  1. The function of DNA is to store all of the genetic information that an organism needs to develop, function, and reproduce. Essentially, it is the biological instruction manual found in each of your cells
  2. ed by x-ray diffraction analysis, a technique for deter
  3. The function of DNA is to store all of the genetic information that an organism needs to develop, function, and reproduce. Essentially, it is the biological instruction manual found in each of your cells. The instructions in DNA are written in a simple alphabet that has just four letters—A, T, C, and G
  4. DNA Function. DNA stores the information needed to build and control the cell. The transmission of this information from mother to daughter cells is called vertical gene transfer and it occurs through the process of DNA replication. DNA is replicated when a cell makes a duplicate copy of its DNA, then the cell divides, resulting in the correct distribution of one DNA copy to each resulting cell
  5. DNA Function DNA is the genetic material which car­ries all the hereditary information. Genes are the small segments of DNA, consisting mostly of 250 - 2 million base pairs
  6. o acid. Eg. AGT -... Mutation and Recombination. When the.

Deoxyribonucleic acid, or DNA, is a biological macromolecule that carries hereditary information in many organisms. DNA is necessary for the production of proteins, the regulation, metabolism, and reproduction of the cell. Large compressed DNA molecules with associated proteins, called chromatin, are mostly present inside the nucleus Functions of DNA: 1. Genetic Information (Genetic Blue Print):. DNA is the genetic material which car­ries all the hereditary information. 2. Replication:. DNA has unique property of replication or production of carbon copies (Autocatalytic function). This is... 3. Chromosomes:. DNA occurs inside. DNA contains the genetic information that allows all forms of life to function, grow and reproduce. However, it is unclear how long in the 4-billion-year history of life DNA has performed this function, as it has been proposed that the earliest forms of life may have used RNA as their genetic material DNA, abbreviation of deoxyribonucleic acid, organic chemical of complex molecular structure that is found in all prokaryotic and eukaryotic cells and in many viruses. DNA codes genetic information for the transmission of inherited traits We argue that, in addition to its coding function, the ability of DNA, unlike RNA, to adopt a B-DNA structure confers advantages both for information accessibility and for packaging. The information encoded by DNA is both digital - the precise base specifying, for example, amino acid sequences - and analogue

The Structure and Function of DNA - Molecular Biology of

  1. The main function of DNA or Deoxyribonucleic Acid is to contain the genetic information of a living being, said genetic information is nothing more and nothing less than therecipeof all physical and structural characteristics of the organism
  2. DNA- Structure, Properties, Types, and Functions DNA stands for Deoxyribonucleic Acid which is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell and are passed down from parents to their children
  3. DNA carries the instructions necessary for your cells to produce proteins that affect many different processes and functions in your body. DNA is fundamental to your growth, reproduction, and health
  4. Deoxyribonucleic acid (DNA) is a molecule that contains the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction. Where is DNA found
  5. Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living things.All known cellular life and some viruses contain DNA.The main role of DNA in the cell is the long-term storage of information

Hello viewers,Watch the video and like it . Do watch my previous videos to get know more about my channel. If you love it please subscribe and comment for n.. Concepts in this video can be found in our newer video: https://youtu.be/8m6hHRlKwxY ! Music in this video used w/ permission from Adrian Holovaty (https://.. What is DNA - Structure and Function. DNA is short for deoxyribonucleic acid. DNA is very special as it is holding the genetic code for all cells in our bodies. That's correct. All cells in our bodies use DNA as a sort of instruction manual. Now, in case you would wish to take away that statement's importance, you may say that DNA is a. The genetic functions of DNA can thus be understood as the synergism of two properties - a tape containing the information store encoding the sequences of proteins and RNA molecules and a polymer existing as double-helical string enabling the packaging, accessibility and replication of the information store In the mammalian genome, DNA methylation is an epigenetic mechanism involving the transfer of a methyl group onto the C5 position of the cytosine to form 5-methylcytosine. DNA methylation regulates gene expression by recruiting proteins involved in gene repression or by inhibiting the binding of tra

The major function of DNA is to encode the sequence of amino acid residues in proteins, using the genetic code. To read the genetic code, cells make a copy of a stretch of DNA in the nucleic acid.. DNA carries genetic information. It has all the instructions that a living organism needs to grow, reproduce and function. Forensic scientists use DNA profiles to help solve crimes. Find out from.. In the long-term, DNA is a storage device, a biological flash drive that allows the blueprint of life to be passed between generations 2. RNA functions as the reader that decodes this flash drive. This reading process is multi-step and there are specialized RNAs for each of these steps The genetic functions of DNA can. thus be understood as the synergism of two properties. - a tape containing the information store encoding the. sequences of proteins and RNA molecules and a. DNA ligase is an enzyme that repairs irregularities or breaks in the backbone of double-stranded DNA molecules. It has three general functions: It seals repairs in the DNA, it seals recombination fragments, and it connects Okazaki fragments (small DNA fragments formed during the replication of double-stranded DNA)

RNA and DNA are simple linear polymers consisting of only four major types of subunits, and yet these molecules carry out a remarkable diversity of functions in cells and in the laboratory. Each newly-discovered function of natural or engineered nucleic acids enforces the view that prior assessments of nucleic acid function were far too narrow. Chapter 13 Lecture Notes: DNA Function I. Transcription (General info) A. Transcription is the synthesis of RNA using DNA as a template. B. Early evidence suggesting an RNA intermediate between DNA and proteins 1. DNA was in the nucleus but proteins were made in the cytoplasm 2. RNA synthesis in the nucleus was exported to the cytoplas The functions of DNA are vital for inheritance, coding for proteins and the genetic blueprint of life. Given the enormity of DNA's functions in the human body and its responsibility for the growth and maintenance of life, it is not surprising that the discovery of DNA has led to such a great number of developments in treating disease function of DNA. The genetic functions of DNA can thus be understood as the synergism of two properties - a tape containing the information store encoding the sequences of proteins and RNA molecules and a poly-mer existing as double-helical string enabling the pack-aging, accessibility and replication of the information store DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA)

about DNA, its properties, and function. We can determine the struc-ture of short DNA fragments with picometer precision, find majority of the genes encoded in DNA, and we can manipulate, stretch and twist in-dividual DNA molecules. We can utilize our knowledge of gene regulatory apparatus encoded in DNA to produce new microorganisms with unex The Excel-DNA XFunctions add-in provides implementations of the XLOOKUP and XMATCH functions that are compatible with the built-in functions introduced in August 2019. Version 0.3 of the add-in is a test version that implements the two functions, and should run in any Windows desktop version of Excel This process involves all the three RNAs performing all different functions to achieve the ultimate common product, protein. Conclusions. DNA and RNA are found to be very important constituents in the living cell. DNA is the usual genetic material of the most organisms while RNA is the genetic material of some viruses DNA: Definition, Structure, Function, Evidence and Types. 19/06/2018. Deoxyribonucleic acid, DNA is the genetic material of us, made up of the deoxy sugar, phosphate and nitrogenous bases.. The life expectancy of every living entity on earth depends on the DNA, hence, it is as important as water and oxygen. It stores and transfers.

To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies. Each DNA sequence that contains instructions to make a protein is known as a gene. The size of a gene may vary greatly, ranging from about 1,000 bases to 1. DNA functions as the genetic material for cells both prokaryotes and eukaryotes. In eukaryotes, DNA is located in the nucleus separated from the cytoplasm by the nuclear membrane. Because prokaryotes lack internal membrane systems, their DNA is not separated from the rest of the cellular contents. Eukaryotic DNA is bound to proteins, forming a. DNA tests, or genetic tests, are used for a variety of reasons, including to diagnose genetic disorders, to determine whether a person is a carrier of a genetic mutation that they could pass on to. The density of DNA is a function of its base and sequence, and satellite DNA with its highly repetitive DNA has a reduced or a characteristic density compared to the rest of the genome. Thus, the.

Revealing the Human Catalogue: Eight-year effort to

What is the Function of DNA? What Does DNA Do

  1. DNA and gene functions. Investigating interactions between DNA sequences, gene products, and environmental factors. Comparing the genomes of humans and other organisms. How Can We Use This Information? Better understanding of human disease. Insight into human origins. Personalized medicine &
  2. DNA ligase is an enzyme that repairs irregularities or breaks in the backbone of double-stranded DNA molecules. It has three general functions: It seals repairs in the DNA, it seals recombination fragments, and it connects Okazaki fragments (small DNA fragments formed during the replication of double-stranded DNA)
  3. Functions of Junk DNA. In genetics, the term junk DNA refers to regions of DNA that are non-coding. Some of this noncoding DNA is used to produce noncoding RNA components such as transfer RNA.
  4. A DNA helicase is an enzyme that functions by melting the hydrogen bonds that hold the DNA into the double helix structure. The area of the DNA where the DNA helicase has unzipped the DNA is known.
DNA & Chromosomes

Plasmid Definition. A plasmid is a small, circular piece of DNA that is different than the chromosomal DNA, which is all the genetic material found in an organism 's chromosomes. It replicates independently of chromosomal DNA. Plasmids are mainly found in bacteria, but they can also be found in archaea and multicellular organisms Genomic DNA Extraction - Principle, Steps and Functions of Reagents. DNA extraction from a sample is a process of purifying the DNA. The sample can be tissue, plant or animal cells, blood, viral DNA or any other DNA containing the sample. The idea of extracting the DNA is quite basic: Disruption of the cell membrane (and cell wall in case of. Learning Targets: I can identify the general structure of DNA. I can define chromosomes I can define genes I can define histones I can define centromere I ca..

Structure and Function of DNA Microbiolog

DNA stands for deoxyribonucleic acid. It is a chemical made up of two long molecules. The molecules are arranged in a spiral, like a twisted ladder. We call this the double helix structure. There. Plasmid DNA- Structure, Function, Isolation And Applications. The plasmid DNA is a bacterial smaller, circular and extrachromosomal DNA, replicate independently- used in the genetic engineering and recombinant DNA technology.. The unique property of self-replication makes it unique and available to use in different molecular genetic. Practice: DNA questions. This is the currently selected item. Eukaryotic gene transcription: Going from DNA to mRNA. DNA. Molecular structure of DNA. Antiparallel structure of DNA strands. Telomeres and single copy DNA vs repetitive DNA. Leading and lagging strands in DNA replication. Transcription and mRNA processing

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What Is DNA?- Meaning, DNA Types, Structure and Function

If Z-DNA were to have biological functions, it seemed highly likely that there would be a class of proteins that would bind specifically to it. Several attempts were made to isolate such proteins. Repetitive DNA, formerly referred to by the misnomer junk DNA, comprises a majority of the human genome. One class of this DNA, alpha satellite, comprises up to 10% of the genome. Alpha satellite is enriched at all human centromere regions and is competent for de novo centromere assembly. Because of the highly repetitive nature of alpha satellite, it has been difficult to achieve genome. DNA is the precipitated by mixing with cold ethanol or isopropanol and then centrifuging. The DNA is insoluble in the alcohol and will come out of solution, and the alcohol serves as a wash to remove the salt previously added. Wash the resultant DNA pellet with cold alcohol again and centrifuge for retrieval of the pellet Excel-DNA XFunctions Add-in. ExcelDna.XFunctions.xll is a small add-in that implements two user-defined functions - XLOOKUP and XMATCH - that are compatible with the newly announced built-in functions.. For some great material (including videos) on the new functions see the Bill Jelen (Mr. Excel) site - The VLOOKUP Slayer: XLOOKUP Debuts in Excel..

DNA polymerase II is a minor component of the cell during normal growth but is inducible by the SOS response. It appears that this enzyme allows nucleotide incorporation opposite AP sites. DNA polymerase II appears to have a highly specialized DNA repair function Although DNA methylation is obligatory in many clades, its prevalence and genomic distribution varies widely, suggesting that there are distinct modes of targeting and function 5,6,7 Its primary function is packaging long DNA molecules into more compact, denser structures. DNA polymerase. a type of enzyme that proofreads the strand, adds nucleotides and bonds them into place. DNA. a molecule that contains the biological instructions that make each species unique DNA availability- Occurs before transcription. Why does a skin cell and muscle cell have different appearance and function even though they have the same DNA code. Start studying Translation Biology. Initiation elongation and termination. DNA is the primary genetic material contained within your cells and in nearly all organisms Describe DNA structure. Click card to see definition . Tap card to see definition . 1. B-DNA structure. 2. T--A; C---G. 3. sugar phosphate backbones run anti-parallel to each other -> 3' and 5' ends of 2 strands are aligned. 4. major groove provides direct accessibility to DNA basis without opening the duplex

DNA Structure & Function: A Simple Guide for Beginner

DNA stands for Deoxyribonucleic Acid. It is the genetic or hereditary material or molecule or genome that is present in the form of chromosomes in the nucleus of the cells. However, some DNA is also found in the Mitochondria, a cell organelle present in the cell. DNA contains or carries genetic code or instructions or information for growth. The enzyme DNA polymerase III is the primary enzyme involved with bacterial DNA replication. It performs the 5'-3' polymerase function, which means that it adds nucleotides to the 3' end of the forming DNA strand during replication. Before replication can start, the enzyme helicase unwinds the two DNA strands The function of DNA methylation in insects. The presence of DNA methylation in several insect lineages (Glastad et al. 2011), despite the highly mutagenic nature of DNA methylation in animals (Elango et al. 2008), suggests that the methylation of DNA makes important functional contributions to insect epigenomes Function Genetics. Methylation, as well as other epigenetic modifications, affects transcription, gene stability, and parental imprinting. It directly impacts chromatin structure and can modulate gene transcription, or even completely silence or activate genes, without mutation to the gene itself. Though the mechanisms of this genetic control are complex, hypo- and hypermethylation of DNA is. DNA is the material that carries all the information about how a living thing will look and function. For instance, DNA in humans determines such things as what color the eyes are and how the lungs work. Each piece of information is carried on a different section of the DNA. These sections are called genes

DNA - Definition, Function, Structure and Discovery

Primase Function. After the DNA is unzipped, by an enzyme called helicase, it is time for primase to come in. Primase starts off the creation of the new strand of DNA by adding the first. Why Replicate DNA? DNA is the genetic material that defines every cell. Before a cell duplicates and is divided into new daughter cells through either mitosis or meiosis, biomolecules and organelles must be copied to be distributed among the cells. DNA, found within the nucleus, must be replicated in order to ensure that each new cell receives the correct number of chromosomes RNA- Properties, Structure, Types and Functions. RNA or ribonucleic acid is a polymer of nucleotides which is made up of a ribose sugar, a phosphate, and bases such as adenine, guanine, cytosine, and uracil. It is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes DNA synonyms, DNA pronunciation, DNA translation, English dictionary definition of DNA. DNA A. adenine T. thymine C. cytosine G. guanine n. A nucleic acid that carries the genetic information in cells and some viruses, consisting of two long..

DNA: Types, Structure and Function of DN

DNA Replication - Leading and Lagging Strands and Enzymes. Leading and lagging strands during DNA replication. Primase makes primers and ligase joins the strand made off of the lagging strand. Topoisomerase cuts and unwinds the circular bacterial DNA. 7.012 Introduction to Biology, Fall 2004 Prof. Eric Lander, Prof. Robert Weinberg, Dr. - The structure of DNA - What nucleotides are - Complementary base pairing - How genes code for proteins - The functions of proteins . Exam board specific info: (probably useful for everyone though) AQA - Separate/triple science only IGCSE Edexcel - Separate/triple science and higher tier only Edexcel - Everything is relevant to. The process by which DNA achieves its control of cell life and function through protein synthesis is called gene expression. A gene is a DNA sequence that contains genetic information for one functional protein. Proteins are essential for the modulation and maintenance of cellular activities Function of Repetitive DNA. The function of repetitive DNA was illuminated by several lines of genome research showing showing that repetitive DNA is an evolutionary device to catalyze formation of new genes by suppressing gene conversion. The insertion of repetitive transposable DNA sequence, SINEs and LINEs acts to break up DNA homologies and allow new gene variations to evolve The evidence. Search. Categorie

After instruction on the structure and function of DNA, introduce the term, replication. Explicit vocabulary instruction is important for building academic literacy and it includes instruction on not only content specific but non-content specific terms. Make sure that students know the meaning and synonyms of key terms Genes are responsible for all aspects of life. Genes are a section of DNA that are in charge of different functions like making proteins. Long strands of DNA with lots of genes make up chromosomes.

Central Dogma of Molecular Biology

• DNA polymerase is responsible for catalyzing synthesis of new strands Replication forks form and involve a leading and a lagging strand • DNA is directional; two strands are antiparallel • DNA polymerase can only synthesize from 5' to 3' direction, adding new nucleotides to the 3' en Genetic Code • The universal code that determines the function of all possible triplets of DNA / mRNA. • Most triplets specify a particular amino acid (= a codon). • Some triplets function as a start or stop signal for protein synthesis. • It is a degenerate code as a particular amino acid may be coded for by more than one codon. Process of Protein Synthesis - transcription and. DNA Structure and Function, a timely and comprehensive resource, is intended for any student or scientist interested in DNA structure and its biological implications. The book provides a simple yet comprehensive introduction to nearly all aspects of DNA structure. It also explains current ideas on the biological significance of classic and alternative DNA conformations Others prevent structural changes in the DNA that repress gene activity (barrier insulators). Some insulators can function as both an enhancer blocker and a barrier. Other regions of noncoding DNA provide instructions for the formation of certain kinds of RNA molecules. RNA is a chemical cousin of DNA Abstract DNA topoisomerases solve the topological problems associated with DNA replication, transcription, recombination, and chromatin remodeling by introducing temporary single- or double-strand breaks in the DNA. In addition, these enzymes fine-tune the steady-state level of DNA supercoiling both to facilitate protein interactions with the DNA and to prevent excessive supercoiling that is.

DNA - Wikipedi

describe the structure and function of DNA, sequence the steps involved in DNA replication, and plan and design a model of DNA. This lesson should be done after a lesson on the structure and function of cells. Learning Outcomes Student will be able to: • construct DNA molecules using the 4 nitrogenous bases (ATCG) The function of the Melanocortin 1 Receptor ( MC1R) gene has recently been investigated from the extinct mammoth and Neanderthal [1], [7]. Isolated MC1R sequences from ancient DNA samples were cloned and transfected into cell lines to examine the function of the receptor in activation assays in vitro. The results of these experiments suggest.

DNA Definition, Discovery, Function, Bases, Facts

This is called 'junk DNA', because its function remained unclear for a long time. However, a certain type of junk DNA that is A Chicken-Egg Question: Where Do Baby Genes Come From DNA primase has molecular weight 60,000 Dalton and contains only a single subunit, which functions synthesize RNA primers. The Dna.B helicase and Dna.G primase constitute a functional unit within the replication complex, called the Primosome. The RNA primer typically is 15-50 bases long

DNA structure and function - PubMe

isolation of DNA usually begins with lysis, or breakdown, of tissue or cells. This process is essential for the destruction of protein structures and allows for release of nucleic acids from the. DNA Isolation Methods Deoxyribonucleic acid (DNA ) isolation is an extraction process of DNA from various sources. Methods used to isolate DNA are dependent on the source, age, and size of the sample. Despite the wide variety of methods used, there are some similarities among them DNA is designed to serve its function. One important function of DNA is Replication - the double helix structure of DNA molecule allows separation of the strands to be able to bind with newly developing DNA molecule. The double helix can give birth to an indefinite number of DNA molecules as long as the replication process goes on structure is known as B-DNA, and represents an average conformation of DNA, based on fibre diffraction studies. However, this average shape of DNA is very unlikely to exist within the cells of living organisms, for several reasons. First, there is simply not enough room for the DNA to be stretched out in a perfect, linear B-DNA conformation

The Function of Chromosomes. Chromosomes are the thread-like structure found in the nuclei of both animal and plant cells. They are made of protein and one molecule of deoxyribonucleic acid (DNA). As the genetic material passes from parents to child, the chromosomes are responsible for containing the instructions that make the offspring unique. Helicase. Helicases are defined as a class of enzymes that catalyze the separation of duplex nucleic acids into single strands in an ATP-dependent reaction and function in DNA modification processing, including DNA replication, DNA repair, recombination, transcription, translation, and many other nucleic acid-related processes (Jankowsky & Fairman, 2007) DNA methylation is an epigenetic mechanism that occurs by the addition of a methyl (CH 3) group to DNA, thereby often modifying the function of the genes and affecting gene expression. The most widely characterized DNA methylation process is the covalent addition of the methyl group at the 5-carbon of the cytosine ring resulting in 5. The section of DNA or the gene that is transcribed is known as the 'transcription unit'. Rather than RNA polymerase moving along the DNA strand, the DNA moves through the RNA polymerase enzyme. As the template strand moves through the enzyme, it is unravelled and RNA nucleotides are added to the growing mRNA molecule

Structure and Function of Proteins. Proteins differ in the number and sequence of amino acids. This sequence of amino acids gives each protein a unique shape and function. From DNA to RNA to Protein. In order to synthesize a protein, the genetic information in the DNA must be converted to an amino acid sequence DNA is a fragile molecule that forms the basis of most, if not all, biological function. As stated before, because of its fragile nature it resides within the nucleus where it is protected. Some DNA is also found in organelles such as mitochondria and chloroplast—think ENDOSYMBIOTIC THEORY to make sense of this (a story for another day)

The Most Important DNA and RNA Functions Life Person

Breaking The Aging Code: Maximizing Your DNA Function For Optimal Health And Longevity|Miryam Ehrlich Williamson, Battlestations: War Winning Weapons of the Second World War|Taylor Downing, Molding for Profit: The injection molding business in the 21st century|Clare Goldsberry, Compendium of Mosaic Techniques: Over 300 Tips, Techniques and Trade Secrets|Bonnie Fitzgeral Understanding how DNA binding proteins control global gene expression and chromosomal maintenance requires knowledge of the chromosomal locations at which these proteins function in vivo. We developed a microarray method that reveals the genome-wide location of DNA-bound proteins and used this method to monitor binding of gene-specific transcription activators in yeast The fidelity of a DNA polymerase is the result of accurate replication of a desired template. Specifically, this involves multiple steps, including the ability to read a template strand, select the appropriate nucleoside triphosphate and insert the correct nucleotide at the 3´ primer terminus, such that Watson-Crick base pairing is maintained The origin of junk DNA Although the term junk DNA was already in use as early as the 1960s -, the term's origin is usually attributed to Susumu Ohno .As Ohno pointed out, gene duplication can alleviate the constraint imposed by natural selection on changes to important gene regions by allowing one copy to maintain the original function as the other undergoes mutation

Used in SDS-PAGE and in DNA extraction procedure. SDS-PAGE (Sodium dodecyl sulphate -polyacrylamide gel electrophoresis) is a technique for separating proteins based on size. Mechanism of action: In DNA extraction procedure, SDS is used for cell lysis and release of cell contents; In SDS PAGE, SDS has 2 function; 1. It denatures the protein 2 Extraction of DNA, RNA, and protein is the basic method used in molecular biology. These biomolecules can be isolated from any biological material for subsequent downstream processes, analytical, or preparative purposes. In the past, the process of extraction and purification of nucleic acids used to be complicated, time-consuming, labor-intensive, and limited in terms of overall throughput DNA methylation. DNA methylation. Methylation of cytosine is a covalent modification of DNA, in which hydrogen H5 of cytosine is replaced by a methyl group. In mammals, 60% - 90% of all CpGs are methylated. Methylation adds information not encoded in the DNA sequence, but it does not interfere with the Watson-Crick pairing of DNA - the methyl. Chloroplasts visible in the cells of Bryum capillare, a type of moss Structure of a typical higher-plant chloroplast Chloroplasts / ˈ k l ɔːr ə ˌ p l æ s t s, - p l ɑː s t s / are organelles that conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in the energy-storage molecules ATP and NADPH while freeing.

Mitochondria and Chloroplasts: Introduction

DNA- Structure, Properties, Types, Forms, Function

ribosomes GIFs Search | Find, Make & Share Gfycat GIFsThe evidence for evolution - online presentationDNA Replication - online presentation