The photosynthetic membrane of Halobacterium salinarium contains ________.
A. chlorophyll a and b
B. bacteriochlorophyll
C. bacteriorhodopsin
D. archaeochlorophyll
Answer: C
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What is the term for learning that occurs only during a brief period early in life and results in a behavior that is difficult to modify.
A. imprinting B. filial imprinting C. innate behavior D. instinct E. operant conditioning
Which of the following is not a factor that weakens host defenses against infections?
A. Old age B. Chemotherapy C. Physical and mental stress D. Genetic defects in immunity E. Strong, healthy body
Based on molecular evidence, how long have fungi been present on land?
a. at least 125 million years b. at least 250 million years c. at least 500 million years d. at least 760 million years
Although asexual reproduction is rapid and efficient, its primary limitation is that _____.
A) each cell must divide individually, leaving the process unusable by multicellular organisms B) genetic information cannot be shuffled into new combinations C) mutations to an organism's DNA are much harder to detect and correct D) a large percentage of any group of offspring may have combinations of features that reduce their chances of survival E) it requires two sets of chromosomes