17.4
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16 terms
Terms | Definitions |
|---|---|
 Which of the following does not occur during the termination phase of translation? | C) A tRNA with the next amino acid enters the P site. |
| What are polyribosomes? | A) groups of ribosomes reading a single mRNA simultaneously |
| What is one function of a signal peptide? | D) to translocate polypeptides across the ER membrane |
| When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by | B) a signal-recognition particle that brings ribosomes to a receptor protein in the ER membrane. |
| Which of the following is not related to ribosomal activity? | B) spliceosome |
| When does translation begin in prokaryotic cells? | B) as soon as transcription has begun |
| Which of the following is (are) true about RNA? | D) Only A and C are true. |
| Which of the following statements are true about protein synthesis in prokaryotes? | B) Translation can begin while transcription is still in progress. |
| Of the following types of mutations, which one is likely to be the most common? | A) point mutation |
| What is the effect of a nonsense mutation in a gene? | C) It introduces a premature stop codon into the mRNA. |
| Which of the above is analogous to a frameshift mutation? | D) THECATATTHERAT |
| Which of the above is analogous to a single substitution mutation? | C) THECATARETHERAT |
| Sickle-cell disease is probably the result of which kind of mutation? | A) point |
| A frameshift mutation could result from | E) either an insertion or a deletion of a base. |
| Which of the following DNA mutations is the most likely to be damaging to the protein it specifies? | A) a base-pair deletion |
| Which point mutation would be most likely to have a catastrophic effect on the functioning of a protein? | B) a base deletion near the start of a gene |
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