21) Inducible operons
A) are active in the presence of a repressor.
B) are generally anabolic pathways.
C) are normally active.
D) usually require an activator to be transcribed.
E) usually require a repressor to be transcribed.
22) Which of the following are considered to be frameshift mutations?
D) both inversion and insertions
E) both deletions and insertions
23) If the codon AAA is changed to AAG, it still codes for the amino acid lysine; this is an example of a
A) silent mutation.
B) nonsense mutation.
C) frameshift mutation.
D) gross mutation.
E) missense mutation.
24) Which of the following causes mutations by creating thymine dimers?
A) nucleotide analogs
B) nitrous acid
C) ultraviolet light
E) gamma rays
25) DNA damage caused by ethidium bromide results in __________ mutations.
D) both inversion and insertion
E) both insertion and deletion
26) Which of the following is a DNA repair enzyme activated by visible light?
B) DNA photolyase
D) DNA ligase
27) The Ames test proves that a chemical is
B) carcinogenic in Salmonella.
C) mutagenic in Salmonella.
D) carcinogenic in humans.
E) mutagenic in humans.
28) The horizontal transfer process known as transduction
A) involves a virus.
B) requires a pilus.
C) requires a cell to be “competent.”
D) requires a plasmid.
E) involves a mutagen.
29) Frederick Griffith discovered
C) the lac operon.
30) In conjugation, F+ cells
A) serve as recipient cells.
B) contain an F plasmid.
C) do not have conjugation pili.
D) can transfer DNA only to other F+ cells.
E) contain “jumping genes.”
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