Cytokinesis in plant cells differs from cytokinesis in animal cells because
a. the contractile protein, actin, is important only in plant cells.
b. a contractile ring forms only in plant cells.
c. in plant cells, the cell plate must also divide into two parts.
d. plant cells have a rigid cell wall.
e. there is no difference.
D
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In terms of number of species, the most successful terrestrial vertebrates that invaded the air are
A. insects. B. pterosaurs. C. birds. D. bats. E. flying monkeys.
Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
Which species is a hermaphrodite?
a. hydra b. banana slugs c. chameleon d. sharks e. pigeons
In aerobic respiration, how many molecules of acetic acid are produced from six molecules of glucose?
A) 1 B) 38 C) 6 D) 12