Question 3 Which of the following mutations had the greatest potential to alter amino acid sequencing in the resulting protein? Select one: a

Subject:BiologyPrice:2.86 Bought3

Share With

Question 3

Which of the following mutations had the greatest potential to alter amino acid sequencing in the resulting protein?

Select one:

a. a frame shift mutation that deletes a single G nucleotide in at the beginning of a gene.

b. a silent mutation due to tRNA "wobble" in reading the third base of a mRNA triplet.

c. an acyclovir induced missense mutation in the first letter of a DNA triplet.

d. a nonsense mutation in the middle of a gene.

 

Question 4

DNA replication errors occur on the average of once per thousand nucleotides copied. While this is a high rate of mutation, young healthy animals very rarely develop cancer or show any other signs of mutation.  Why? 

Select one:

a. DNA repair enzymes are more active/effective in young animals.

b. the immune systems of young animals more effectively recognize and destroy tumors.

c. genes that code for anti-tumor factors are more active in young animals.

d. all of the above are true.

 

Question 5

Chemicals, toxins and heat may denature cellular proteins. However, if the stress is not too extreme the partially denatured proteins may be correctly refolded by:  

Select one:

a. DNA repair enzymes

b. Repair mutator genes

c. DNA polymerase

d. Chaperone proteins