Which of the following do most neurons have that other cells do not?
a. Lipid membrane
b. Soma
c. Nucleus
d. Dendrites
d. Dendrites
Most neurons have dendrites, which are tree-like structures that extend away from the cell body to receive electrochemical messages from other neurons.
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Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into the cell?
A) decreasing extracellular sucrose concentration B) decreasing extracellular pH C) decreasing cytoplasmic pH D) adding an inhibitor that blocks the regeneration of ATP E) adding a substance that makes the membrane more permeable to hydrogen ions
Which functional group acts as an organic base?
a. carbonyl b. hydroxyl c. phosphate d. amino
e. carboxylA millicurie, a unit of radioactivity, is
a. a tenth of a curie. b. a hundredth of a curie. c. a thousandth of a curie. d. a millionth of a curie.
Which one of the following best explains how water moves freely across a plasma membrane?
A) Water moves directly through the phospholipid bilayer because of the charges on phospholipids. B) Water is brought into the cell by facilitated diffusion but released by exocytosis. C) It is actively transported across the membrane. D) Water moves through protein-lined channels in the plasma membrane. E) The passage of water across a plasma membrane requires facilitated transport.