BIOL 1090 Lecture Notes - Lecture 1: Base Pair, Pentose, Uracil
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9 Jan 2018
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A cyclic nitrogenous base: a nucleoside contains only the 5-carbon sugar and nitrogenous base, no phosphate group. Midterm question: distinguish a nucleoside from a nucleotide. Nitrogenous bases found in dna: thymine, cytosine, adenosine, guanine. Dna is double stranded and the two strands are antiparallel. One full revolution = ~10 base pairs = 3. 4 nm. A double-stranded, standard b-dna model genome consists of a single chromosome that is. 1000 - 10 base pairs per revolution so 10,000 / 10. How many phosphates are there in the double stranded dsdna assuming the. Rst 5" nucleotide on each strand has 1 phosphate? a. 20,000- 10,000 on one strand and 10,000 on the other. 35% g so 35% c, leaves 30% left which is a and t. so, 15% a. If the dna was single-stranded and 10,000 nucleotides long and there was 35: how much a would there be? a. You cant gure it out because its single stranded.
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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. |