In the Brown and Brenn modification of the Gram stain for tissues, gram-positive organisms appear:
a) bright red
b) blue-black
c) yellow-orange
d) green
Answer: b) blue-black
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A group is considered paraphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. the common ancestor of the group is not included in the group. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
The major causes of plant diseases are
a. protozoa. b. viruses. c. bacteria. d. worms. e. fungi.
The diversity of terrestrial vascular plants has increased almost continuously since the ____ period
a. Devonian b. Ordovician c. Cambrian d. Silurian e. Proterozoic
For an animal to move in one direction, its muscles must do all of the following except
A. exert a force in the opposite direction. B. overcome the effects of friction. C. exert a force in the same direction. D. overcome the effects of gravity. E. spend energy.