Which of the following statements about voltage-gated sodium channels is true?
a. All cells contain voltage-gated sodium channels.
b. Voltage-gated sodium channels are integral membrane proteins.
c. Voltage-gated sodium channels have roughly equal permeability to Na+ and K+.
d. Voltage-gated sodium channels open in response to any change in membrane potential.
e. Voltage-gated sodium channels open in response to binding of acetylcholine.
B
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Hydrogen bonds form between molecules containing ________ bonds; the hydrogen bond is between a hydrogen atom of one molecule and a partially ________ charged atom of another.
A. nonpolar covalent; positively B. ionic; positively C. nonpolar covalent; negatively D. polar covalent; positively E. polar covalent; negatively
The skin wound was ______________________ to remove dirt
Fill in the blank(s) with correct word
Frequently, several different signals or molecules are needed in order to produce an immune response by a B cell or T cell. The second signal in this process is called
A. opsonization. B. copresentation. C. complement activation. D. antigen processing. E. costimulation.
Smooth muscle has ________ and not troponin.
A. norepinephrine B. fibronectin C. calmodulin D. titin