The stage in a normal growth curve when cells reach the maximum rate of cell division is the
A. lag phase.
B. log phase.
C. stationary phase.
D. death phase.
E. fast phase.
Ans: B. log phase.
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The tube feet of a sea star
(a) bear tiny toes. (b) are located only at the tips of the arms. (c) function in movement. (d) protect the organism from predatory fish.
You have just invented a time machine and you want to investigate the past (the dream of every paleontologist!). When is the earliest time in Earth history that you could go back and not have to have an oxygen tank so that you could breathe normally?
A. Cambrian Period B. Phanerozoic Eon C. Archaean Eon D. Quaternary Period E. Devonian Period
The proteins of the cell membrane are
a. enzymes. b. channels through the membrane. c. transporters that move substances across the membrane. d. receptors. e. all of these.
Which statement about the application of insecticides is true?
A) To control agricultural pests, pest management uses biological controls, chemicals, or cultural methods, but never a combination of these. B) Simply killing many individuals is often the best way to reduce the size of a pest population. C) Most insecticides kill the pest but not the pest's natural predators. D) Pest species can rebound faster than their predators because the pests often have a higher reproductive rate than predators have.