8. Alpha-amanitin is a toxin produced by the death cap mushroom. It blocks the s

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8. Alpha-amanitin is a toxin produced by the death cap mushroom. It blocks the synthesis of mRNA. Why is it deadly to eat death cap mushrooms? a. It would block DNA synthesis b. It would not allow the splicing process c. It would not allow proteins to be made d. It inhibits ribosomes 9. Which of the following is (are) post transcriptional modification occurring in eukaryotic mRNAs? a. Addition of poly(A) tail to the 3'end b. Addition of a ethyl-guanosine cap (5'cap) Both A and B d. None of the above 10. The universal regulatory mechanism in eukaryotes for controlling gene expression includes: a. Control of the processing of mRNA after it is transcribed from DNA but before it leaves the nucleus, and control of the rate it leaves the nucleus b. Control of the genes transcribed and the rate they are transcribed c. Control of mRNA in the cytoplasm after it leaves the nucleus, including changed to mRNA before translation begins d. All of these mechanisms are used: there is no single universal mechanism 11. Riboswitches are located on a. mRNA b, DNA c. Ribosomes d. Both A and D can affect mRNA secondary structure and control translation initiation. a. aptamer b, DNA elF1 d. None of the above 13. RNA polymerase can distinguish the noncoding regions from the coding regions. a. True b. False 14. Genetic experiments have shown that base pairing between U1 snRNA and splice site of mRNA precursor is a. Sufficient for binding b. Necessary but not sufficient for binding c. Unnecessary for binding d. Both A and C 15. When does U6 snRNP associate with the 5'end ofthe intron by base pairing through the U6 RNA? a. occurs first prior to formation of lariat intermediate

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