Synthesis of an inducible enzyme requires
A. substrate bound to repressor.
B. corepressor and repressor binding to operator.
C. repressor alone bound to operator.
D. substrate bound to promoter.
Answer: A
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Which of the following is produced by meiosis?
a. somatic cells b. animal gametes c. polyploid cells d. diploid cells
e. zygotesYou observe that two sympatric species occupy different ecological niches. What kind of barrier originally caused their speciation?
A. prezygotic B. not enough information C. postzygotic
The vir genes of the Ti plasmid
a. are transferred to the plant cell. b. are an example of a classic bacterial system in which stimulation of a sensor protein causes automethylation and transfer of the methyl to the second protein. c. are activated by phenolic compounds released by plant wounds. d. are expressed constitutively. e. are not required for transfer of DNA.
Which of the following account for 20% of the greenhouse gases recorded annually?
a. deforestation of dry tropical forests b. deforestation of moist tropical forests c. burning of fossil fuels d. burning of coal e. urbanization