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.
Correct Answer:
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Q7: X-rays
A)have no effect on DNA.
B)cause thymine trimers.
C)cause
Q8: Segments of DNA capable of moving from
Q9: The formation of a covalent bond between
Q10: The source of variation among microorganisms that
Q11: The characteristics displayed by an organism in
Q13: Antibiotics
A)cause mutations to occur.
B)may act as alkylating
Q14: The largest group of chemical mutagens consists
Q15: Transposons
A)are informally known as jumping genes.
B)may cause
Q16: Which change in a gene's DNA sequence
Q17: Intercalating agents
A)act during DNA synthesis.
B)often result in
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