Protein Synthesis problems
- 1. The growing polypeptide chain is released from the ribosomes when
Options- A. a chain terminating codon is reached
- B. a chain terminating tRNA binds to the ribosome
- C. the 7-methyl guanosine cap is reached
- D. the poly A tail is reached Discuss
Correct Answer: a chain terminating codon is reached
- 2. Signal peptide protein removal that is translocated across a membrane is accomplished by
Options- A. fMet aminopeptidase
- B. trypsin
- C. signal peptidase
- D. chymotrypsin Discuss
Correct Answer: signal peptidase
- 3. The structure in a bacterium that indicates an active site for protein synthesis is
Options- A. a chromosome.
- B. a cell membrane,
- C. a flagellum.
- D. a polysome. Discuss
Correct Answer: a polysome.
- 4. The direction of amino acid transfer to the growing polypeptide chain is
Options- A. from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
- B. from the P site to the A site on the ribosome
- C. from the A site to the E (exit tRNA site) site on the ribosome
- D. from the P site to the E site on the ribosome Discuss
Correct Answer: from the P site to the A site on the ribosome
- 5. The lac operon contains the z, y and a structural genes
Options- A. encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
- B. encoding p-galactosidase and galactose permeases
- C. encoding P-galactosidase only
- D. None of the above Discuss
Correct Answer: encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
- 6. Phosphorus is taken up by the cell during the process of
Options- A. carbohydrate synthesis.
- B. protein synthesis,
- C. lipid synthesis.
- D. ATP synthesis. Discuss
Correct Answer: ATP synthesis.
- 7. Processive synthesis is a characteristic feature of
Options- A. all DNA polymerases.
- B. DNA Pol III at a replication fork.
- C. removal of RNA primers on Okasaki fragments.
- D. DNA mismatch repair Discuss
Correct Answer: DNA Pol III at a replication fork.
- 8. Ribosomes select the correct tRNAs
Options- A. then bind to the appropriate mRNA
- B. solely on the basis of their anticodons
- C. depending on their abundance in the cytosol
- D. with the least abundant anticodons Discuss
Correct Answer: solely on the basis of their anticodons
- 9. Amino acids are joined together into a protein chain by which of the following?
Options- A. Transfer RNA
- B. DNA polymerase
- C. Hydrogen bonds
- D. Messenger RNA Discuss
Correct Answer: Transfer RNA
- 10. Which is required for protein synthesis?
Options- A. tRNA
- B. mRNA
- C. rRNA
- D. All of these Discuss
Correct Answer: All of these
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