Which of the following is a characteristic of underdeveloped countries?
a. high birth rates
b. zero population growth
c. high percentage of older individuals
d. low percentage of young individuals
a. high birth rates
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If the sperm cell contributes mitochondria to the oocyte, it is called _______
A. paternal leakage B. maternal leakage C. paternal inheritance D. mitochondria E. imprinting
Which of the following statements correctly traces the route of water through a sponge?
A. enters through the osculum into the spongocoel and exits via the ostia B. enters through the spongocoel into the osculum and exits via the ostia C. enters through the ostia into the osculum and exits via the spongocoel D. enters through the ostia into the spongocoel and exits via the osculum E. enters through the osculum into the ostia and exits via the spongocoel
Which of the following drugs acts to block reuptake of neurotransmitters?
1.aspirin 2.acetylcholine 3.Prozac 4.Ecstasy 5.Prozac and Ecstasy
What axonal characteristic facilitates the propagation of an action potential along a myelinated axon?
a. Voltage-gated Na+ and K+ channels are concentrated in the myelinated axonal segments. b. Voltage-gated Na+ and K+ channels are concentrated in the unmyelinated axonal segments. c. Voltage-gated Na+ channels are concentrated in the myelinated axonal segments; voltage-gated K+ channels are concentrated in the unmyelinated axonal segments. d. Voltage-gated K+ channels are concentrated in the myelinated axonal segments; voltage-gated Na+channels are concentrated in the unmyelinated axonal segments. e. Voltage-gated Na+ K+ channels are spread evenly throughout both myelinated and unmyelinated segments