A) It takes time for sub-cellular units to evolve the ability to digest new media.
B) A bacterium is not actively producing all the enzymes it can code for, and it takes time to induce and amplify the production of the currently needed enzymes.
C) Binary fission becomes more and more efficient.
D) A new media dissolves away repressor proteins.
E) Structural genes act more slowly than metabolic genes.
G) D) and E)
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A) cigarette smoke.
B) ultraviolet light.
C) cabbage and related vegetables.
D) ethylene dibromide (EDB) .
E) ziram, a chemical used to prevent fungal diseases on crops.
G) C) and D)
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A) The proto-oncogenes mutate and become oncogenes which are continuously active. There is also an associated loss of tumor suppressor gene activity allowing uncontrolled growth of cells.
B) The oncogenes mutate and become proto-oncogenes which are continuously active. There is also an associated loss of tumor suppressor gene activity allowing uncontrolled growth of cells.
C) The proto-oncogenes mutate and become oncogenes which stop functioning altogether. There is also an associated increase in the tumor suppressor gene activity allowing uncontrolled growth of cells.
D) The oncogenes mutate and become proto-oncogenes which stop functioning altogether. There is also an associated increase in the tumor suppressor gene activity allowing uncontrolled growth of cells.
F) B) and C)
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A) prokaryote
B) eukaryote
C) bacterium
D) All of the answer choices are correct.
F) A) and D)
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Answers should include in the ...View Answer
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Answers may vary. The trp operon is a re...View Answer
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A) a different combination of DNA binding proteins (transcriptional factors) may regulate the activity of a particular gene.
B) enhancers may be involved in the promotion as well as regulation of gene transcription.
C) the control may be due to the phosphorylation of transcriptional factors by a kinase.
D) All of the choices are correct.
E) Only two of the choices are correct.
G) B) and D)
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A) a viral gene with no relation to the host cell's genes.
B) a mutated form of a proto-oncogene.
C) a bacterial gene that causes cancer in the host.
D) always seen in human cancer cells.
E) a gene that turns off cellular reproduction.
G) D) and E)
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A) euchromatin.
B) heterochromatin.
C) methylated RNA and histones.
D) DNA with many methyl groups.
F) A) and B)
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A) The structural genes make products that are part of an anabolic pathway for the synthesis of tryptophan.
B) It is normally turned off if tryptophan is present.
C) Tryptophan acts as the corepressor.
D) The regulator gene product is inactive by itself.
E) Tryptophan binds to the repressor protein and inactivates it.
G) B) and E)
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A) It regulates the production of a series of five enzymes.
B) It is normally turned off if glucose is present.
C) Lactose binds to the repressor protein and inactivates it.
D) It is an inducible system.
E) The structural genes make products that allow lactose metabolism.
G) A) and B)
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