Reinforcement is most likely to occur when _____

A) the environment is changing
B) hybrids have lower fitness than either parent population
C) prezygotic isolating mechanisms are in place
D) gene flow is low


Answer: B

Biology & Microbiology

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Combinatorial control refers to the fact that:

A. each gene has its own unique enhancers found nowhere else on that chromosome. B. each gene has a unique combination of thousands of different enhancers. C. each gene has a unique combination of several different enhancers. D. each gene has a unique combination of several enhancers plus several dozen regulatory transcription factors. E. each gene has a unique combination of several regulatory transcription factors, each of which can combine with up to three dozen transcriptional complexes.

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What is the percentage of individuals who died after contracting the SARS virus?

A. 10 D. 75 B. 25 E. 100 C. 50

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Which of the following statements best describes RNAi techniques for gene silencing?

A) siRNAs block DNA replication. B) siRNAs inhibit transcription of a gene. C) siRNAs inhibit mRNA splicing. D) siRNAs trigger degradation of mRNAs to prevent their translation. E) siRNAs prevent transport of mRNA from the nucleus to the cytoplasm.

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Which cells in the root have a suberin layer called the Casparian strip?

A. pericycle B. endodermis C. root hair D. cortex E. epidermis

Biology & Microbiology