Biology 30603Cell BiologyExam IIISpring 2005

Biology 30603Cell BiologyExam IIISpring 2005 - Biology...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
B C D E Biology 30603 Cell Biology Exam III Spring 2005 1. Polycistronic mRNA is found a. Only in eukaryotes b. Only in prokaryotes c. In both prokaryotes and eukaryotes d. Nowhere in nature e. Only in mitochondrial genes 2. Which one of the following modifications occurs in bacteria and not in eukaryotes? a. capping with a 7-methyl guanosine b. splicing c. polyadenylation d. none of the above occur in bacteria e. All of the above (a, b, and c) occur only in bacteria 3. The function of telomerase is a. Unknown b. To repair DNA at the center of the chromosome at a region known as the telomere c. To extend the ends of the chromosome at a region known as the telomere d. To digest RNA/DNA hybrids e. More than one of the above is correct 4. Tetracycline blocks the tRNA in the A site of the ribosome. This tRNA would be covalently linked to a. Nothing b. A polypeptide c. An amino acid d. All the above are correct e. To tetracycline 5. α -amanitin is a mushroom toxin that binds to and inhibits RNA polymerase II. This property can be used to a. Design antibiotics against bacteria b. Design drugs to kill eukaryotic cells c. Stimulate transcription of mRNA d. Stimulate DNA synthesis e. Specifically inhibit replication of eukaryotic cells 6. Heat shock proteins are a. Produced by eukaryotic cells when they are killed by heat b. What gives you heat rash in the Texas summer c. Chaperones d. Essential for transcription e. Saponins
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7. When bacteria are grown in the presence of Glucose, transcription from the Lac operon is a. Repressed b. Activated c. Unaffected d. Increased to metabolize glucose e. Decreased to metabolize lactose 8. The enzyme Primase is required for a. The synthesis of short stretches of DNA to begin DNA replication b. Activation of RNA polymerase c. The synthesis of short stretches of RNA to begin DNA replication d. The activation of DNAase e. None of the above 9. Proofreading of newly replicated DNA strand is carried out by a. a. An enzyme called Proofase b. b. DNA helicase c. c. P53 d. d. DNA polymerase e. e. RNA polymerase 10. Prokaryotes do not have to contend with an ‘end-replication’ problem that requires telomerase because a. The genomes are too small to matter b. They replicate their DNA continuously c. They tolerate mutations easily d. Their genomes are circular e. Their genomes are linear 11. Mutations in the DNA mismatch repair system can lead to diseases such as a. AIDS b. Hereditary nonpolyposis colon cancer c. Lyme’s disease d. Chronic fatigue syndrome e. None of the above 12. Exposure of DNA to UV radiation can result in a. The formation of adenine dimers b. Methylation of cytosine c. Dephosphorylation of DNA d. The formation of thymine dimers e. The conversion of guanine to xanthine 13. The inability of DNA polymerase to synthesize DNA in a 3’ à 5’ direction a. Helps to preserve the fidelity of replication
Background image of page 2
b. Prevents proofreading of the new strand of DNA c. Results in the synthesis of the lagging strand d. Can be circumvented by increasing the concentration of DNA polymerase in the
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

Biology 30603Cell BiologyExam IIISpring 2005 - Biology...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online