The external morphological traits of two North American species of tree frog (Hyla versicolor and H. chrysoscelis) are
very similar; therefore, scientists use ____ to distinguish them.
a. internal anatomy
b. behavioral traits
c. homologous appendages
d. skin coloration
e. analogous structures
ANSWER: b
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Women of childbearing age should be vaccinated against ________.
A. influenza A B. chickenpox C. German measles D. shingles
Which of the following is false?
a. Periderm is a primary tissue. b. There is no tissue in animals that corresponds to meristem tissue of plants. c. Growth from cell division at the tips of stems and roots produces primary growth. d. Divisions of the lateral meristem increase the diameter of the roots and stems. e. Lateral meristem activity produces secondary growth.
The text says that bovine somatotropin can be given to cows to boost milk production. Suppose that it would be possible to alter the genes of cows so that the animals always made excess somatotropin
What concerns do you think people might have about this procedure?
Plant cells typically achieve cytokinesis by
A. forming a cell plate across the middle of the cell. B. chromosome elongation. C. chromosome condensation. D. forming a cleavage furrow that pinches the cell into two. E. binary fission.