The increased mortality of coniferous trees in the Pacific Northwest between 1955 and 2007 is an example of a
reaction to ____.
a. density-independent factors
b. density-dependent factors
c. predation
d. crowding
e. population growth
ANSWER: a
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A newborn is identified as having cystic fibrosis. While both parents are healthy, a genetic screening of both parents will most likely reveal:
A. the father is a carrier of the mutant CF allele. B. the mother is a carrier of the mutant CF allele. C. both mother and father are carriers of a mutant CF allele. D. neither mother nor father are carriers; spontaneous mutation caused the baby's disease.
Basically a flower is composed of four concentric rings or parts known as:
A. calyxes B. spales C. whorls D. androeciums E. gynoeciums
Soils on ridgetops are generally drier than valley soils
Indicate whether the statement is true or false
Which of the following refers to the mechanism of horizontal gene transfer naturally responsible for the spread of antibiotic resistance genes within a bacterial population?
A) conjugation B) generalized transduction C) specialized transduction D) transformation