Biol 112 - Oct. 7 (C)

Biol 112 - Oct. 7 (C) - Structure of nucleic acids Quiz...

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1 Quiz open until Wed Structure of nucleic acids 2 μm Replicating thing criteria: Have a container Membranes (wall) Gather raw material Gather or make parts Gather and transform energy All done by proteins Have a set of instructions DNA Pass instructions to replicas Proteins and DNA Mechanism to read the instructions RNA and proteins Figure 4-00 Phosphate group attached to 5 carbon of the sugar Could be adenine ( A ), DNA monomers: deoxyribonucleotides Structure of a deoxyribonucleotide Hydroxyl (OH) group on 3 carbon of the sugar thymine ( T ), guanine ( G ), cytosine ( C ) Primary structure of DNA Nitrogen- containing bases project from the backbone Sugar-phosphate backbone of DNA strand Phosphodiester bond links deoxyribonucleotides
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2 (a) Complementary base pairing Sugar-phosphate “backbone” of DNA (b) The double helix (c) A space-filling model Complementary base pairs joined by hydrogen bonding Antiparallel strands (their 5 -to-3 polaritieslie in opposite directions) 5’ carbon The backbone of each strand of DNA is a polymer of riboses linked with the phosphates which link the #5 carbon of one ribose to the #3 carbon of the next ribose. So there is an orientation 5’ - 3’, or 3’ - 5’. 3’ carbon 1’ 2’ 4’ Which of the following best explains why it matters that DNA and RNA sequences have “a 5’ to 3’ (or a 3’ to 5’) direction”? A. It is necessary for synthesis. B. Because “rats” is not same as “star”. C. Because DNA is double stranded. D. It is necessary to distinguish DNA from RNA. Everyone knows that in double stranded DNA, A pairs with T and G pairs with C (called Watson-Crick base pair rules). Which of the following statements best explains why? 1. “A” can only hydrogen bond with “T” and “C” can only hydrogen bond with “G”.
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This note was uploaded on 01/15/2012 for the course BIOL 112 taught by Professor Benbasat during the Winter '04 term at UBC.

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Biol 112 - Oct. 7 (C) - Structure of nucleic acids Quiz...

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