BIOL 142 Lecture Notes - Lecture 9: Start Codon, Uracil, Thymine
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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. |
Which of the following is the best characterization of the reading frame in gene expression?
Question 5 options:
The reading frame of a gene is set by the first three nucleotides in a gene's promoter. | |||||||||||||||||||||
Every gene has three possible reading frames, but all three specify the same protein. | |||||||||||||||||||||
Every gene has three possible reading frames, and thus encodes three different proteins. | |||||||||||||||||||||
The reading frame of a gene is set by the first three nucleotides at the 5' end of the mRNA. | |||||||||||||||||||||
The reading frame of a gene is set by the first AUG codon near the 5' end of the mRNA. Which of the following is/are NOT involved in initiating transcription in eukaryotes? Question 9 options:
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