Which of the following blood vessels are small, thin, and porous enough to exchange substances at the tissue level of organization?
A. small arteries
B. veins
C. arterioles
D. venules
E. capillaries
Answer: E
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Leaves arise
a. as part of the periderm. b. as part of secondary growth. c. at the nodes. d. as a result of differentiation of cambium cells. e. from the lateral, not the apical, meristem.
Generation of an action potential by a neuron may ultimately stimulate
A) another nerve cell. B) skeletal muscle cells. C) gland cells. D) smooth muscle cells. E) All of the above may be stimulated by a signal.
Why does active transport require ATP?
a) An input of energy is needed to allow the movement of molecules from an area of low concentration to one of higher concentration. b) An input of energy is needed to speed up the rate of facilitated diffusion. c) An input of energy is needed to maintain the conformation of transport proteins. d) An input of energy is needed to both speed up the rate of facilitated diffusion and maintain the conformation of transport proteins.
As the resolution of a microscope system improves, the size of the smallest object that can be seen clearly ________.
A. is larger. B. is not affected. C. is smaller.