15 . Accuracy in the translation of mRNA into the polypeptide sequence depends o

Question

15. Accuracy in the translation of mRNA into the polypeptide sequence depends on specificity in the

A) binding of ribosomes to mRNA.

B) shape of the A and P sites of ribosomes.

C) binding of the tRNA anticodon to the mRNA codon.

D) attachment of amino acids to tRNAs.

E) both C and D

26. In the Polymerase Chain Reaction (PCR) which of the following best describes the complete sequence of steps occurring during every cycle?

1. The primers hybridize to the target DNA.

2. The mixture is heated to a high temperature to denature the double stranded target DNA.

3. Fresh helicase and DNA polymerase is added.

4. Taq DNA polymerase extends the primers to make a copy of the target DNA.

A) 4, 1, 2

B) 1, 3, 2, 4

C) 3, 4, 1,

D) 1, 4, 2

E) 2, 1, 4

Explanation / Answer

15. E) both C and D.

The specific amino acid needs to be attached and the codon-anticodon interactions on tRNA-mRNA need to be correct.

26. E.

First denaturation occurs under high temperatures to separate the two strands of DNA. Then primers are added and they anneal. Then Taq polymerase is added to extend the primers

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