Two bird species exhibit postzygotic isolation in that half of the hybrids formed between them are sterile. If Haldane's rule applies here, then the individuals that are sterile are likely to be:
a. female. c. young.
b. male. d. old.
A
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Referring to Figure 5-21, which of the following modifications requires ATP?
A. methylation B. ubiquitination C. myristoylation D. acetylation E. adenylylation
How does the cell overcome inhibition from irreversible inhibitors?
a. by binding a second inhibitor, which forces the enzyme's conformation to dislodge the first inhibitor b. by phosphorylating the enzyme, altering the enzyme's conformation to dislodge the inhibitor c. by altering the cellular pH, which will decrease the bonding between the enzyme and the inhibitor d. by degrading the enzyme-inhibitor complex and generating new enzyme e. by upregulating the expression of other enzymes with similar catalytic functions
What is the relationship between the promoters for antisense RNA and the promoters of their target genes?
A) The promoters are oriented so that they transcribe opposite strands of the same segment of DNA. B) The promoters are found in different chromosomal regions but are controlled by the same sigma factors. C) The sense and antisense RNAs use the same promoter, both RNAs are produced from a single transcript that is processed. D) The sense and antisense RNAs are transcribed using the same promoter that is bidirectional.
Dependence on animal vectors for fertilization and dispersal is characteristic of many species of ____.
A. ferns B. angiosperms C. mosses D. conifer E. cycads