At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than
b. about the same as
c. higher than
d. exactly the same as
e. less negative than
ANSWER: a
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Essay on the Principle of Population, written by Thomas Malthus in 1798, influenced Darwin's thoughts as he struggled to understand what mechanisms could be at work to produce evolution. Malthus proposed that populations of animals and plants, including humans,
A. evolved from mainland to islands, thus explaining why the island flora and fauna resembled the mainland species so closely. B. decreased arithmetically in numbers while the nutrients available increased geometrically. C. increased arithmetically in numbers while the nutrients available only increased geometrically. D. increased geometrically in numbers while the nutrients available only increased arithmetically. E. increased geometrically in numbers while the nutrients available increased arithmetically.
A genotype refers to
A) the alleles present in an individual. B) expression patterns of certain genes. C) the environmental components of a trait. D) the number of chromosomes that a person has.
The step of translation in which amino acids are added one at a time to the growing polypeptide is
A. elongation. B. mitosis. C. initiation. D. termination. E. transcription.
Which of the following is an incorrect match?
a. pea pods; dehiscent b. strawberry; berry c. cherry; drupe d. corn; indehiscent e. tomato; berry