quiz 3

Question 1

Mutations:
a) are temporary changes in the DNA sequence or structure

b) produce allelic variation

c) are more likely to be beneficial than harmful

d) all of the above

e) none

Answer 1

b, produce allelic variation

Question 2

Because they only affect a single amino acid, missense mutations do not have a significant effect on protein function

Answer 2

false

Question 3

A particular enzyme that functions in converting a substrate into a colored product in the hair follicle has a mutation. The mutation functions just fine at regular atmospheric pressure, but when the organism is located at high elevation (decrease in atmospheric pressure) the enzyme fails and no hair pigment is seen. What type of mutation is this?

Answer 3

conditional

Question 4

which of the following as considered an induced mutation?

a) base modifier
b) depurination
c) DNA polymerase errors
d) tautomeric shifts

Answer 4

base modifiers

Question 5

In the Ames test:
a) mutagens cause lethal mutations, reducing the number of colonies

b) mutagens cause mutations that disrupt the ability of the cell to produce histidine

c) mutagens will cause an increase in the number of reversion phenotypes

d) only mutagens that cause transversions can be identified

Answer 5

c, mutagens will cause an increase in the number of reversion phenotypes

Question 6

which repair mechanisms can best identify the template strand from the newly made complementary strand of DNA to repair errors in the newly made DNA if a polymerase error occured?

Answer 6

methyl directed mismatch repair