Transposons
A. are informally known as jumping genes.
B. may cause insertion mutations.
C. may cause knockout mutations.
D. were first recognized in plants.
E. All of the choices are correct.
Chemical mutagens often act by altering the
A. alkyl groups of the nucleobase.
B. nucleobase sequence.
C. number of binding sites on the nucleobase.
D. hydrogen bonding properties of the nucleobase.
Segments of DNA capable of moving from one area in the DNA to another are called
A. base analogs.
B. intercalating agents.
C. transposons.
D.
inverted repeats.
The designation his- refers to
A. the genotype of a bacterium that lacks a functional gene for histidine synthesis.
B. the genotype of a bacterium that has a functional gene for histidine synthesis.
C. the opposite of a hers gene.
D. bacteria that are auxotrophic for histidine.
E. the genotype of a bacterium that lacks a functional gene for histidine synthesis AND bacteria that are auxotrophic for histidine.
Which change in a gene's DNA sequence would have the least effect on the eventual amino acid sequence produced from it?
A.
Deletion of two consecutive nucleotides
B.
Addition of one nucleotide
C.
Addition/deletion of three consecutive nucleotides
D.
Substitution of one nucleotide AND addition of 1 nucleotide
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