Graded potentials
A) spread over the plasma membrane in decremental fashion.
B) are not propagated for long distances.
C) are graded.
D) can summate.
E) all of the above.
Answer: E) all of the above.
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Which of the following shows the fine structure of a plasmalemma (cell membrane) and the details of intracellular structures?
A) light microscopy B) ultrasound C) transmission electron microscopy D) magnetic resonance imaging E) scanning electron microscopy
Dentin is found in the:
a. root of the tooth b. crown of the tooth c. neck of the tooth d. all of the above
Pinocytosis is a form of
a. active transport. b. cytokinesis. c. endocytosis. d. exocytosis. e. hemolysis.
What is the best description of a secondary active transport process that cotransports an amino acid with Na+?
A. Both Na+ and the amino acid bind on the side of the membrane where the Na+ concentration is lowest, and undergo net movement to the other side of the membrane. B. Na+ and the amino acid bind to opposite sides of the membrane, and Na+ undergoes net transport from the side of the membrane with higher Na+ concentration toward the side with lower concentration, while the amino acid moves in the opposite direction. C. Both Na+ and the amino acid bind on the side of the membrane where the Na+ concentration is higher, and both are transported to the side of the membrane where the Na+ concentration is lower. D. Both Na+ and the amino acid bind to the side of the membrane where the amino acid concentration is highest and are transported toward the side of the membrane where the amino acid concentration is lower. E. Na+ and the amino acid bind to opposite sides of the membrane, and the amino acid undergoes net transport from the side of the membrane with lower Na+ concentration to the side of the membrane where the Na+ concentration is higher.