Brock Biology of Microorganisms Chapter 10
Exam Questions With Correct Answers
A mutant that has a nutritional requirement for growth is an example of a(n)
A) autotroph.
B) auxotroph.
C) heterotroph.
D) organotroph. - answer✔B) auxotroph
Consider a mutation in which the change is from UAC to UAU. Both codons specify the amino
acid tyrosine. Which type of point mutation is this?
A) silent mutation
B) nonsense mutation
C) missense mutation
D) frameshift mutation - answer✔A) silent mutation
A mutation that readily reverses to restore the original parental type would most likely be due to
a(n)
A) deletion.
B) insertion.
C) point mutation.
D) frameshift mutation. - answer✔C) point mutation
Which process listed below does NOT require homologous recombination to maintain the new
genetic material in the recipient cell?
A) conjugation of an F+ plasmid
B) gene transfer through a genetic transfer agent
C) transduction by a dsDNA phage Mu
D) transformation of a linear piece of DNA - answer✔B) gene transfer through a genetic transfer
agent
The mutagens 2-aminopurine and 5-bromouracil are examples of
A) alkylating agents.
B) nucleotide base analogs.
C) chemicals reacting with DNA.
D) None of the answers are correct. - answer✔B) nucleotide base analogs
The killing of cells by UV irradiation involves
A) absorption at 260 nm by proteins only.
B) absorption at 260 nm by RNA only.
C) formation of pyrimidine dimers.
D) formation of purine dimers. - answer✔C) formation of pyrimidine dimers
Ionizing radiation does NOT include
A) gamma rays.
B) UV rays.
C) X-rays.
D) cosmic rays. - answer✔B) UV rays
Which of the following methods may introduce foreign DNA into a recipient?
A) transformation
B) transduction
C) conjugation
D) transformation, transduction, and conjugation - answer✔D) transformation, transduction, and
conjugation
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