In plant cells, the ____ provides cellular support and protects the cell from pathogens
a. cytoplasm
b. cell membrane
c. cytoskeleton
d. plasmodesmata
e. cell wall
ANSWER: e
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What initiates the sodium-potassium pump?
A. Three sodium ions bind to the cytoplasmic side of the protein. B. Three sodium ions are translocated out of the cell. C. Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind. D. Two potassium ions are transported into the cell. E. ATP binds to the protein which becomes phosphorylated (ADP is released).
Red blood cells have been very useful in the study of membranes and the protein components that provide structural support. Which of the following proteins is the principal fibrous protein in the cortex of the red blood cell?
(a) tubulin (b) attachment proteins (c) actin (d) spectrin
In the Northern Hemisphere, when does the summer solstice occur?
A) when the sun reaches its northern maximum B) when the South Pole is closest to the sun C) when solar irradiance is at its minimum D) when lengths of day and night are equal at all latitudes
How are root nodule and arbuscular mycorrhizal symbioses similar?
A) They both use lipochitin oligosaccharide signaling factors to initiate root colonization. B) They both supply nitrogen to the host plant through nitrogen fixation. C) They both increase absorption of nutrients from soil. D) They are both required for the growth and reproduction of their host plants.