Which of the following is the primary assumption made by researchers when designing experiments to
model how life may have arisen?
a. The chemical reactions of living things are only possible in living systems.
b. Living organisms are composed of elements commonly found in the universe and on
Earth.
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.
D
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The Immigration Restriction Act of 1924 was supported by research that demonstrated that Western Europeans were
genetically superior to Eastern Europeans. a. True b. False
Rhizobium bacteria benefit legumes in a mutual symbiosis by ______________.
A. decomposing complex organic material and building humus in the topsoil B. releasing excess Nitrogen into the water C. fixing atmospheric Nitrogen into the soil in a chemical form plants can use D. weathering bedrock into soil particles such as clay, sand, and silt E. performing photosynthesis
What is meant by the clonal expansion of a B cell?
a. An activated B cell will engulf and digest anything foreign. b. An activated B cell divides into cells that give rise to memory B cells and plasma cells. c. An activated B cell will immediately begin to produce antibodies. d. An activated B cell will kill infected host cells.
All of the following are characteristics of viruses except
A. they can cause mild diseases. B. they can cause fatal diseases. C. they can be crystallized. D. they often have a geometric capsid. E. they have a viscous fluid inside their capsids.