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
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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.
What is the percentage of individuals who died after contracting the SARS virus?
A. 10 D. 75 B. 25 E. 100 C. 50
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.
Which cells in the root have a suberin layer called the Casparian strip?
A. pericycle B. endodermis C. root hair D. cortex E. epidermis