Two species of closely related squirrels both feed on acorns produced by oak trees. One species feeds exclusively near
the top of the tree and the other feeds exclusively towards the bottom of the tree. This is an example of ____.
a. competitive exclusion
b. resource partitioning
c. mutualism
d. commensalism
e. mimicry
ANSWER: b
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A trait with a heritability value of 0.75 indicates that 75% of the phenotypic variability seen in the population is caused by ____ of the population
a. genetic differences b. environmental differences c. concordance d. epigenetic effects e. the equal contribution of the genotype and the environment
Which statement about the large intestine is FALSE?
a. It is also called the colon. b. It harbors beneficial bacteria. c. It is involved with the absorption of sodium. d. It is involved with the absorption of water. e. It secretes digestive enzymes.
How would a calcium deficiency affect the process of skeletal muscle contraction?
A) Skeletal muscles would not be able to utilize ATP as a source of fuel. B) The action potential would be blocked from entering the muscle fiber. C) The myosin heads would remain attached to actin molecules. D) Myosin heads would not bind to actin efficiently.
Which bacterium causes infections in many burn victims?
A) Moraxella catarrhalis B) Pseudomonas aeruginosa C) Escherichia coli D) Bartonella bacilliformis