Anthropoids or higher primates include all of the following except
A. Old World monkeys.
B. humans.
C. New World monkeys.
D. lemurs.
E. apes.
Answer: D
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Which of the following is a common feature of primary insect symbionts?
A) accelerated mutation rates B) extreme genome reduction C) high A+T / low G+C content D) accelerated mutation rates, extreme genome reduction, and high A+T / low G+C content
The outside of a neuron is positively charged at resting potential. Why do K+ ions leave the cell when K+ channels open during an action potential?
A. The diffusion gradient is the only factor that affects ion movement. B. K+ ions are actively pumped out by the sodium-potassium pump acting in reverse. C. Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase. The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. D. Negatively charged proteins leave the cell at the onset of the action potential.
The descending arm of the loop of Henle is permeable to ____ but impermeable to ____
a. water; potassium ions b. water; sodium ions c. sodium ions; water d. potassium ions; water e. all choices are incorrect
Pasteurization of milk helps to prevent ________.
A. mononucleosis B. endocarditis C. tularemia D. brucellosis E. plague