How did the experimental group differ from the control group in the 2005 peacock butterfly experiment?
a. They were different species.
b. Their native habitat of the forest differed.
c. They were spotless and soundless.
d. They tasted worse.
e. They preferred different flowers species.
ANSWER: c
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It is believed that the coelacanths and lungfish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis?
A) Like amphibians, they are tied to the water for reproduction. B) Their fins have skeletal and muscular structures similar to amphibian limbs. C) They have highly evolved nervous and circulatory systems. D) They have lungs and are able to breathe air when water is scarce. E) They enter a hibernative stage when food is scarce, as many tetrapods do.
All of the following are ways cancer cells avoid growth and invasion restriction imposed by the immune system except
A) they are heterogeneous groups of cells. B) cancer cells often respond to density-dependent growth factors. C) some cancer cells produce leukotoxins. D) some cancers often "hide" in dense supporting tissue. E) some cancers produce low levels of surface antigens.
A key feature of all viral infections is the
A. integration of viral DNA into host DNA. B. disintegration of host DNA. C. addition of a lipid membrane to the virus. D. separation of viral nucleic acid from the capsid.
A suggested explanation that might be true and is subject to testing by further observations is a(n):
A. hypothesis. B. experiment. C. scientific principle. D. generality. E. theory.