The tumor suppressor protein Rb
a. is phosphorylated by the CDK-cyclin complex.
b. receives a signal from p53 regarding DNA damage.
c. binds E2F, preventing entry into the S phase.
d. receives a signal regarding cell size.
e. All of the above.
Ans: e
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Which of the following is not one of the properties of life?
a) Respond to stimuli b) Ability to adapt c) Homeostasis d) No need for reproduction
How do corals react when water temperatures are too high?
A. They leave the shelter of the reef. B. Corals release water at higher temperatures. C. Symbiotic algae living within corals are expelled. D. The metabolic optimum can adapt. E. Corals are more pigmented at higher temperatures.
The molecule shown above is testosterone, a substance that has important regulatory functions in
humans and many other animals. Molecules with regulatory functions like testosterone are called ____.
a. phytosterols b. enzymes c. lipoproteins d. hormones e. receptors
In the process of diffusion, molecules move from areas where
A. their concentration is higher to areas where their concentration is lower using energy from ATP. B. their concentration is lower to areas where their concentration is higher through specific protein channels or carriers. C. their concentration is lower to areas where their concentration is higher until an equilibrium is reached. D. their concentration is higher to areas where their concentration is lower until an equilibrium is reached.