During contraction,
a. cross-bridges of muscle filaments are broken and
reformed.
b. ATP is used to break cross-bridges.
c. muscle cells use glucose derived from glycogen
as an energy source.
d. glycogen depletion may lead to muscle fatigue.
e. all of these occur.
Answer: e
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The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
Given that oxygen is toxic to anaerobic bacteria, describe how they must have adapted to survive in the present environmental conditions on Earth
What will be an ideal response?
How is it that people can donate blood plasma twice per week?
A. Plasma only contains fluid and dissolved substances such as proteins that can be rapidly replaced. B. Plasma contains platelets which can be replaced quickly. C. Plasma contains red blood cells which can be replaced quickly. D. Plasma contains only water and can be rapidly replaced. E. Plasma is regenerated from the blood cells injected back into the donor.
Which carbohydrate, found only in plants, is indigestible by humans?
a. glycogen b. starch c. glucose d. sucrose e. cellulose