Question

13. A researcher studying hemoglobin predicts tha aying hemoglobin predicts that a histidine within the protein is Portant for binding oxygen. She used site-directed mutagenesis to change histidine (CAU) to one for lysine (AAA). However, the mutant hemos as well as the wild-type and has no other apparent changes. This type utagenesis to change a codon for the mutant hemoglobin still binds oxygen anges. This type of mutation is called A. suppression B. synonymous C. nonsense D. silent E. frameshift 14. Using the choices below, choose the answer that shows the proper sequen 1. An aminoacyl-tRNA binds to the A site. 2. A peptide bond forms between the new amino acid and a polypeptide chain. 3. tRNA leaves the P site, and the P site remains vacant. 4. A small ribosomal subunit binds with mRNA. 5. tRNA translocates to the P site. A. 1,3,2,4,5 B. 5, 4, 3, 2,1 C. 4, 1, 3, 2,5 D. 2, 4,5, 1,3 E. 4, 1, 2, 5,3 15. The mRNA is created by copying the A. sense strand. B. anti-sense. C. lagging strand. D. leading strand.

Answer 1

QUESTION 13

In this case, we are observing a silent mutation. These kind of mutations can change the sequence of nucleotides in the DNA that codes for a specific protein. However, this will result in the same amino acid or in a different amino acid but with the same properties. In this example, the change of histidine for lysine did not represent a change in the biological activity, so it is a silent mutation.

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