What assumption is made by researchers when designing experiments to model how life may have arisen on Earth?
a. The chemical reactions of living things are only possible inside living systems.
b. Living organisms are composed of elements commonly found on Earth, but absent in the rest of the universe.
c. Conditions on Earth have not changed over time.
d. Life arose on Earth from non-living matter.
e. The development of living cells from nonliving matter was very rapid.
ANSWER: d
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Prions are of significance because they cause infections of
A. plants. B. prokaryotes. C. domestic animals and humans. D. fungi.
Vesicles from the Golgi body that will become lysosomes contain enzymes for ____
a. aerobic respiration b. photosynthesis c. breaking down cellular debris d. protein synthesis e. digesting amino acids and fatty acids
Which of the photographs in the above figure
represents the seedless vascular plants? a. moss b. fern c. conifer d. monocot e. all of these
During exercise, O2 is depleted in muscle tissue. What effect would this have on internal respiration?
A) There would be decreased diffusion of O2 out of the blood and into the muscle tissue and a decrease in heart rate to bring more O2 to the exercising muscle. B) There would be decreased diffusion of O2 out of the blood and into the muscle tissue. C) There would be increased diffusion of O2 out of the blood and into the muscle tissue. D) There would be increased diffusion of O2 out of the blood and into the lungs.