In the cell cycle, controlled degradation of regulatory proteins occurs via the

A) P450 - protease pathway.
B) cyclin proteolysis pathway.
C) ubiquitin-proteosome pathway.
D) kinase inhibition pathway.
E) none of the above


C) ubiquitin-proteosome pathway.

Biology & Microbiology

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Which of the following statements about structural maintenance of chromosomes (SMC) proteins is true?

A. They have four distinct domains: N, C, and two ?-helical coiled-coil domains. B. They are usually dimeric and dimerization forms the ATP-binding site. C. Dimers of SMC proteins are all homodimers having identical subunits. D. Dimerization of SMC proteins creates a molecule with two heads and two ATP-binding sites. E. The ATP bound by SMC proteins is hydrolyzed before the heads come together in the dimer.

Biology & Microbiology

The insecticide parathion is detoxified in the body by the enzyme paraoxonase, which has two alleles (Q and R). A person with the genotype Q/Q living in an area of high organophosphate use would be expected to _____

1.rapidly metabolize parathion 2.be completely unable to metabolize parathion 3.be extremely sensitive to parathion poisoning 4.metabolize parathion more rapidly in infancy than during adulthood

Biology & Microbiology

If you want to keep cut flowers fresh, treat them with

A) auxin. B) abscisic acid. C) cytokinin. D) gibberellin. E) ethylene.

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Binary fission is more complicated than mitosis. 2. Gram-positive bacteria stain purple when the Gram stain is complete. 3. Prokaryotic cells that move in response to oxygen levels are said to display chemotaxis.

Biology & Microbiology