Some anticancer drugs block signal transduction pathways activated by growth factors. Which of the following would be a good target for such a drug?
A. an inhibitor of adenylyl cyclase
B. an inhibitor of a protein kinase cascade
C. an inhibitor of phospholipase C
D. a phosphatase inhibitor
E. an inhibitor of Ca2+ release
Answer: B
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SIV causes symptomless infections in monkeys and apes, yet causes AIDS-like disease in chimpanzees. HIV is closely related to SIV and causes AIDS in humans. Which of the following is the best explanation for these observations?
a. Monkeys, apes, and chimpanzees are all genetically very similar b. The effects of viruses on different species is random c. Chimpanzees and humans have a more recent common ancestor d. SIV is most likely lytic in apes and monkeys e. SIV is most likely latent in chimpanzees
An organ must contain at least:
A. two different tissue types. B. connective tissue. C. all four of the tissue types. D. two different muscle types. E. two different cell types.
The nucleus of the eukaryotic cell functions:
A. to store the cell's hereditary information B. to house the nucleolus C. as the command center for the cell D. All of the choices are correct.
A(n) __________ is a group of genes that code for related or identical proteins as a result of gene duplication events
a. ortholog b. gene family c. homolog d. chromosome e. none of the above