BIOL 1020 Lecture 28: Lecture 28
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12 May 2017
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BIOL 1020 Full Course Notes
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There are cytosine, guanine. four different nitrogenous bases: thymine, adenine, Hydrogens on nitrogenous bases make hydrogen bonding possible. Sugar-phosphate backbone: sugar unit (deoxyribose)- sugar connects to nitrogenous bases- phosphate units attach sugars. Sugar units give us directionality- 3rd carbon on the sugar joins to lower phosphate unit- 5th carbon on sugar joins to its own phosphate group. Referred to as 5" end if the 5" carbon is at the top, and the 3" end if the carbon is at the bottom. Dna molecules have directionality- 3" and 5" end ** Chromosomes when they undergo s phase they are double stranded chromosomes (don"t confuse with dna) Maurice wilkins and rosalind franklin were using a technique called x-ray crystallography to study molecular structure. Franklin produced a picture of the dna molecule using this technique. Key to the work that watson and crick did.
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Related Questions
QUESTION 1. Compared to eukaryotic genomes, only prokaryotic genomes:
A. contain DNA organized by histones. |
B. contain usually one, circular chromosome. |
C. contain plasmid DNA. |
D. have chromosomes contained in a nucleus. |
QUESTION 2. Azathioprine is a drug that may be prescribed to transplant recipients to reduce the chance of tissue rejection reactions. In its active state, it acts as a purine analogue, inhibiting DNA biosynthesis. This means that 6-mercaptopurine will be inserted in place of a purine containing nucleotides during DNA replication. Given this drug's mode of action, you would expect it to be incorporated into DNA in place of:
A. nucleotides containing guanine or cytosine. |
B. nucleotides containing adenine or thymine. |
C nucleotides containing adenine or guanine. |
D. nucleotides containing guanine nucleotide or uracil. |
QUESTION 3. RNA is distinguished from DNA because only RNA:
A. typically exists as a single-stranded molecule. |
B. has a 3' to 5' directionality. |
C. is composed of nucleotides that contain the sugar deoxyribose. |
D. is composed of nucleotides that contain the nitrogen bases T, C, G, and A. |
QUESTION 4. How are RNA nucleotides different from DNA nucleotides? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.
A. RNA nucleotides do not contain thymine. |
B. RNA nucleotides use the sugar ribose, while DNA nucleotides do not. |
C. RNA nucleotides lack phosphate. |
D. RNA nucleotides incorporate pyrimidine nitrogen bases, while DNA nucleotides only incorporate purine nitrogen bases. |