Proto-oncogenes
A. code for proteins that promote the cell cycle.
B. promote apoptosis.
C. are considered "loss-of-function" mutations.
D. become tumor suppressor genes when mutated.
E. code for angiogenic growth factors.
Answer: A
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In most plants stomata are
a. open during the night and closed during the day. b. nearly always open. c. closed only when guard cells are not exposed to sunlight. d. almost never open. e. open during the day and closed during the night.
At the bottom of an energy pyramid are the ____
a. primary producers b. secondary producers c. primary consumers d. secondary consumers e. tertiary consumers
Which of the following best describes advantages conferred by compound leaves versus simple leaves?
a. There's a greater chance of capturing photons in intermittently shady areas. b. There is less chance of damage in high-wind areas. c. There's a reduced chance of herbivory. d. There is less surface area for water loss. e. There's a greater chance of capturing photons in intermittently shady areas and less chance of damage in high-wind areas.
A structural molecule found in eukaryotic cytoskeletons, but NOT flagella, cilia, and centrioles is (actin/flagellin/tubulin).
Fill in the blank(s) with the appropriate word(s).