Which of the following is not in the same clade as the others?
a. Birds
b. Dinosaurs
c. Lizards
d. Crocodiles
e. Alligators
Answer: c. Lizards
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Which of the following statements does NOT describe a function of the cell walls of bacteria?
A. They maintain cell shape. B. They prevent cross-fertilization. C. They avoid disintegration in water with low concentrations of salt. D. They protect against other bacteria. E. They protect against viruses.
When neurons are not producing electrical signals, there is still a voltage difference across their membranes. What is this voltage called?
A. channel-gate bias B. electrolyte voltage C. equilibrium potential D. resting potential E. ion current
Dwarfism may be due to insufficient production of
a. mineralocorticoid. b. glucocorticoid. c. calcitonin. d. GH e. the parathyroid hormone.
Undifferentiated cells that can divide and specialize to form a variety of different cells are called:a
differential cells. b. mother cells. c. somatic cells. d. stem cells. e. morphogens