How do immune cells with sensitivity to self-antigens become eliminated?
A. They are lysed through the action of
membrane attack complexes.
B. They are destroyed by macrophages.
C. They undergo apoptosis.
D. They enter a G0 state of cell cycle and
cannot replicate.
C
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Which regulatory mechanism is activated when the overall energy availability of a cell is high?
A. Citrate inhibits phosphofructokinase 1. B. ADP up-regulates phosphofructokinase 1. C. ATP inhibits phosphofructokinase 1. D. AMP up-regulates phosphofructokinase 1.
An individual plant that possesses both male and female reproductive organs is known as
A) imperfect. B) dioecious. C) perfect. D) asexual.
Select the false statement
a. Biomes near the poles have less rainfall than biomes on the equator. b. Altitude can result in biomes that are not characteristic for a particular latitude. c. Deserts have less rainfall due to their distance from the ocean. d. Rainforests occur in both the Northern and Southern Hemisphere. e. Deserts occur in both the Northern and Southern Hemisphere.
The use of a molecular clock
A. depends on nucleic acid changes being neutral and not tied to adaptation. B. depends on nucleic acid changes occurring at a fairly constant rate. C. still needs to be calibrated with the fossil record. D. All of the choices are correct.