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DNA controls cellular functions and heredity by carrying the genetic instructions in its double-stranded structure. DNA is made up of nucleotides containing deoxyribose, phosphate groups, and organic bases (adenine, guanine, cytosine, thymine) that bond together in a double helix with base pairing between adenine-thymine and cytosine-guanine.
1 of 23. Download now. DNA is a double-stranded molecule that forms a helical structure. It is composed of nucleotides, each containing a phosphate group, deoxyribose sugar, and a nitrogenous base. There are two types of bases: purines (adenine and guanine) and pyrimidines (cytosine and thymine). The bases form rungs that link the strands via ...
DNA is a double-stranded molecule that forms a helical structure. It is composed of nucleotides, each containing a phosphate group, deoxyribose sugar, and a nitrogenous base. There are two types of bases: purines (adenine and guanine) and pyrimidines (cytosine and thymine). The bases form rungs that link the strands via hydrogen bonds between ...
DNA: Structure and Function. Unit 7. Recall:. DNA is made of nucleotides Nucleotides contain a sugar, phosphate, and a base In DNA, the bases are adenine, cytosine, guanine, and thymine. What is DNA?. Deoxyribonucleic acid The “blueprint” of the cell Stores genetic information. Download Presentation. long polypeptide chains.
DNA Structure.ppt . Slideshow Share. Sign in. File. Edit. View. Help View only . Rec . HTML view of the presentation ... DNA Notes. HTML view of the presentation ...
DNA’s Role. This chemical substance is present in the nucleus. of all cells in all living organisms. DNA controls chemical changes which. take place in cells. The kind of cell which is formed, (muscle, nerve etc) is controlled by DNA. The kind of organism produced (buttercup, giraffe, human etc) is controlled by DNA.
Human DNA consists of approximately 3 x 109 such “base pairs”. The DNA double helix (secondary structure) DNA is double stranded: each molecule of DNA is composed of two polynucleotide chain that are joined together by formation of hydrogen bonds between the bases. DNA strands are twisted to form a double helix.
Oct 19, 2010. 760 likes | 3.75k Views. DNA: Structure and Function The DNA Revolution 1940s-1960s Griffith & Avery—DNA transformed pneumococcus bacteria. Encouraged the study of prokaryotic chromosomes. Hershey and Chase—Bacteriophage experiment. DNA from viruses is injected to host bacteria cells. Griffith and Avery. Download Presentation.
Both DNA and RNA are made up of nucleotides, which consist of a nitrogenous base, a 5-carbon sugar (ribose in RNA and deoxyribose in DNA), and a phosphate group. Nucleoproteins are proteins linked to nucleic acids and are important components of chromosomes. DNA replication occurs through a semi-conservative process in both prokaryotes and ...
Download ppt "DNA: History and Structure." A Brief History of DNA (deoxyribonucleic acid): Discovery of DNA by many different scientists 1928 – Griffith – studied how bacteria made people sick; found that a gene could change harmless bacteria into disease-causing ones 1944 – scientists led by Avery – DNA is a nucleic acid that stores ...
Presentation Transcript. DNA STRUCTURE STRUCTURE, FORCES AND TOPOLOGY. DNA GEOMETRY • A POLYMER OF DEOXYRIBONUCLEOTIDES • DOUBLE-STRANDED • INDIVIDUAL deoxyNUCLEOSIDE TRIPHOSPHATES ARE COUPLED BY PHOSPHODIESTER BONDS • ESTERIFICATION • LINK 3’ CARBON OF ONE RIBOSE WITH 5’ C OF ANOTHER • TERMINAL ENDS : 5’ AND 3’ • A ...
19. Download ppt "DNA Structure." DNA Structure DNA consists of two molecules that are arranged into a ladder-like structure called a Double Helix. A molecule of DNA is made up of millions of tiny subunits called Nucleotides. Each nucleotide consists of: Phosphate group Pentose sugar Nitrogenous base.
DNA is made up of deoxyribose, phosphate groups, and four nitrogenous bases (adenine, guanine, cytosine, thymine). 2. The bases pair up through hydrogen bonding between complementary base pairs (adenine with thymine, cytosine with guanine). 3. The paired bases and sugar-phosphate backbone form the structure of the DNA double helix, with the ...
The structure of DNA • In 1953, Watson and Crick proposed the structure of DNA • DNA is shaped like a long zipper that is twisted into a coil like a spring. its shape is called double helix. DNA Replication of DNA • Before a cell can divide by mitosis or meiosis, it must first make a copy of its chromosomes.
DNA is a double-stranded molecule that forms a helical structure. It is composed of nucleotides, each containing a phosphate group, deoxyribose sugar, and a nitrogenous base. There are two types of bases: purines (adenine and guanine) and pyrimidines (cytosine and thymine). The bases form rungs that link the strands via hydrogen bonds between ...
Three dimensional structure of DNA. A double helix has major groove and minor groove Within each groove base pairs are exposed and are accessible to interactions with other molecules DNA-binding proteins can use these interactions to “read” a specific sequence. Download Presentation. cells contain several kinds. protein function.
6 DNA Structure PO4 A molecule of DNA is formed by millions monomers called nucleotides joined together in a long chain PO4 PO4 PO4. 7 Nucleotide Structure 3 important parts: Phosphate group. Sugar (Deoxyribose) Nitrogenous base (G,C,A,T) Phosphate & sugar make up the “backbone”. 8 4 Nitrogenous Bases ADENINE (A) THYMINE (T) CYTOSINE (C ...
The primary function of DNA is to serve as the template for its own replication and transcription into RNA to direct protein synthesis. RNA- A polymer of ribonucleotides, is a single stranded structure. There are three major types of RNA- m RNA,t RNA and r RNA. Besides that there are small nuclear,micro RNAs, small interfering and heterogeneous ...
DNA Structure. DNA Structure. Will Fagan IB Biology 2011. 3.3 DNA Structure. DNA- Deoxyribonucleic acid Each nucleotide of DNA is composed of a phosphate group, a sugar called deoxyribose and a molecule that is called a nitrogenous base. . Nitrogenous Bases . Adenine Thymine Guanine Cytosine. 301 views • 22 slides
Summary of DNA Replication • DNA is a double helix • Bases in middle make up sequence • Semi-conservative replication • Strands separate • Each one is copied • One “lagging” and one “leading” • Forming two double helixes from one • Proteins do all the copying • Incredibly accurate. Chromosomes are BOTH – DNA and Protein!