BIOL 1107 Lecture Notes - Lecture 4: Rna Polymerase Ii, Pyrophosphate, Ribonucleotide
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30 Jan 2018
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5" carbon attached to phosphate group (open 5 end) Each nucleotide has a 5" and 3" section. In the dna sequence 5"-tgac-3", the phosphodiester linkage b/w the guanine and the adenine connects: The 3" end of the guanine to the 5" end of the adenine. Dna composed of millions of base pairs. Genes composed of thousands of base pairs. Genes: sequence of dna that forms a functional protein. Dna -> transcription -> rna -> translation -> protein. The organisms that are going to translate rna (ribosomes) are outside the nucleus (why we need mrna) Single (little more fragile), doenst have to be stable over the lifetime of an organism cuz it"s created so much. Region that is 25 bases in front of the beginning. Rna continues to make a copy until it binds to. Template (each genes has a particular one) The one that will be transcribed to the rna transcript. Either strand of dna can be a template.
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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. |