B) DNA replication only C) transcription and translation D) translation only E) transcription only 18) Inducible operons A) are active in the presence of a repressor. B) usually require a repressor to be transcribed. C) are normally active. D) usually require an activator to be transcribed. E) are generally anabolic pathways. 19) Which of the following causes mutations by creating thymine dimers? A) nucleotide analogs B) gamma rays C) benzopyrene D) nitrous acid E) ultraviolet light 20) The Ames test demonstrates that a chemical is A) mutagenic in humans. B) mutagenic in Salmonella. C) carcinogenic in Salmonella. D) carcinogenic in humans. E) carcinogenic. 21) The horizontal transfer process known as transduction A) requires a plasmid. B) involves a virus. C) requires a pilus. D) involves a mutagen. E) requires a cell to be "competent." Bacteria acquire new DNA from the environment in the process of A) recombination. B) conjugation. C) transposition. D) transformation. E) the SOS response. conjugation, F+ cells
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18) Inducible operons: The correct answer is D) usually require an activator to be transcribed. Show more…
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7) Many identical copies of genes cloned in bacteria are produced as a result of which of the following processes? A) plasmid replication only B) bacterial cell reproduction only C) transformation D) plasmid and bacterial cell reproduction 8) Which of the following enzymes is required to make complementary DNA (cDNA) from RNA? A) restriction enzymes (endonucleases) B) helicase C) DNA ligase D) reverse transcriptase 9) In DNA technology, the term vector can refer to A) the enzyme that cuts DNA into restriction fragments B) the sticky end of a DNA fragment C) a SNP marker D) a plasmid used to transfer DNA into a living cell
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19. In DNA replication, the leading strand grows towards the replication fork, while the lagging strand grows away from the replication fork. a. mRNA; leading b. leading; lagging c. leading; template d. lagging; template e. lagging; leading 20. Which of the following is not necessarily related to tumor formation? a. an overactive MYC gene b. proto-oncogenes c. inactive tumor-suppressor genes d. cell de-differentiation e. metastasis A densely staining region of highly compacted chromatin is known as heterochromatin and is generally not transcribed. Retroviruses make RNA copies of DNA by the process of reverse transcription. Bacterial gene regulation occurs mainly at the transcriptional level.
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