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DNA Structure PowerPoint Presentation

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Description : Check out this medical presentation on Genetics, which is titled "DNA Structure", to learn about Deoxyribonucleic acid (DNA).

Tags : Genetics, DNA Structure, Deoxyribonucleic acid

Published on : Aug 29, 2021 | Views : 2008 | Downloads : 1

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Slide 1-

DNA Structure
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DNA stands for Deoxyribonucleic acid
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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
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Nucleotides Phosphate Pentose Sugar Nitrogenous Base
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Nucleotides The phosphate and sugar form the backbone of the DNA molecule, whereas the bases form the “rungs”. There are four types of nitrogenous bases.
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Nucleotides
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Nucleotides Each base will only bond with one other specific base. Adenine (A) Thymine (T) Cytosine (C) Guanine (G) Form a base pair. Form a base pair.
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Base-Pair Rule Adenine <==> Thymine Guanine <==> Cytosine The sides of the DNA ladder are phosphate & sugar held together by hydrogen bonds
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DNA Structure Because of this complementary base pairing, the order of the bases in one strand determines the order of the bases in the other strand.
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Base Pair Rule One side: A T A T C A T G C G G G Other side:
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DNA Structure To crack the genetic code found in DNA we need to look at the sequence of bases. The bases are arranged in triplets called codons. A G G - C T C - A A G - T C C - T A G T C C - G A G - T T C - A G G - A T C
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DNA Structure A gene is a section of DNA that codes for a protein. Each unique gene has a unique sequence of bases. This unique sequence of bases will code for the production of a unique protein. It is these proteins and combination of proteins that give us a unique phenotype.
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How the Code Works The combination of A,T,G,C determines what traits you might have, for ex. C A T C A T = purple hair T A C T A C = yellow hair
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Think of the bases of DNA like letters. Letters form words.... Words form sentences.... *endless combinations
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Let's Review What We Know About DNA 1. DNA stands for: De _____ ribo ______ acid 2. What is the shape of DNA? _______________ 3. Adenine always pairs with _______________ 4. The sides of the DNA ladder are deoxyribose and _____ 5. Guanine always pairs with _____________ 6. What is the complimentary sequence: A A T G C A 7. The two sides of DNA are held together by _______ bonds. 8. DNA is composed of repeating subunits called ______________________ 9. What are the 4 bases that make up the rungs of the DNA ladder? _______________________________________
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