Bio3110 Lab quiz#5
Name:_______________________________
Section:____________________________
I. Multiple choice ( 2pts each)
1. Mutations maybe classified based on its impact on protein sequence. Which of the
following leads to premature termination of protein synthesis?
A. Missense mutation
B. Neutral mutation
C. Silent mutation
D. Nonsense mutation
E. None of the above
2. A back mutation or reverse mutation is point mutation that restores the original sequence
and hence the original phenotype. This type of mutation is illustrated in which phenotype
of the D7 S. cerevisiae strain?
A. Red/pink colonies
B. Isoleucine auxotrophy
C. Isoleucine prototrophy
D. Tryptophan prototrophy
E. None of the above
3. Which of the following statement(s) is (are) true with regards to mutation?
A. Spontaneous mutations are common due to the inefficiency of DNA repair
mechanisms
B. Mutations found in somatic cells may be passed on to future generations
C. Compounds or chemicals that are known to be mutagenic may be considered
carcinogenic
D. A and B
E. None of the above
