A community in which many species are involved in a food web is ____
a. more fragile since organisms have more than a single food source
b. more fragile since organisms have only a single food source
c. more stable since organisms have more than a single food source
d. more stable since organisms have only a single food source
e. most prone to damage from human interference
ANSWER: c
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Which of the following statements is true regarding cell-cell adhesion?
A) Adhesion is coordinated with many cellular processes except cell survival. B) Adhesion molecules include plakoglobulin, which cements two cells together. C) Adherens junctions are exclusive to plant cells. D) Adhesive junctions are characterized by the attachment of long molecules of hyaluronate. E) Adhesive junctions are dynamic in response to cellular signals.
Characteristics that are found in the bacteria called Mycobacterium are:
a. a cell wall that contains N-glycolylmuramic acid and has a high lipid content. b. a cell wall that has a low lipid content. c. sensitive to decolorization by acidified alcohol. d. rapid-growers, as compared with most other human pathogenic bacteria.
What was Darwin's main purpose during his time aboard the HMS Beagle?
A. to develop evidence that could be used to support the theory of evolution B. to serve as the ship's naturalist C. to document evidence that would support the concept of natural selection D. Darwin was a sailor with no specific purpose aboard the HMS Beagle.
With incomplete dominance, a likely ratio resulting from a monohybrid cross would be ________
A) 3:3 B) 9:3:3:1 C) 3:1 D) 1:2:1 E) 1:2:2:4