Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, Taxol must affect
A) the formation of the mitotic spindle.
B) anaphase.
C) formation of the centrioles.
D) chromatid assembly.
E) the S phase of the cell cycle.
Ans: A) the formation of the mitotic spindle.
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You are investigating a clinical disorder in one of your patients. You discover that the patient has an autoimmune disease that targets and destroys fibroblasts. This disorder would most likely affect
A) fiber production by the cells, as occurs with blood clotting. B) annulus formation. C) hyluronate production in the joints. D) collagen production. E) all of the above
Plastids originated from which of the following groups of prokaryotes?
A. Cyanobacteria B. Spirochaetes C. Proteobacteria D. Archaea E. Actinobacteria
The term used for removing environmental pollution is
A. Sewage treatment B. greenhouse treatment C. Biotechnology D. Bioremediation
Which cell connection is correctly paired with its function?
A) desmosomes: form a water-tight seal between cells B) tight junctions: join cells together but allow fluid to pass around them C) gap junctions: prevent fluid flow between cells D) tight junctions: act like Velcro to fasten cells together E) gap junctions: allow salts, amino acids, and other materials to pass between cells