Which of the following is NOT a function of membrane proteins? a. They serve as

Question

Which of the following is NOT a function of membrane proteins?

a. They serve as channels

b. They serve as membrane-bound enzymes

c. They serve as receptor sites

d. They determine the fluidity of the membrane

e. They serve as carriers

Membrane potential

a. Refers to a separation of charges across the membrane or to a difference in the relative nuber of + and – charges in the ECF and ICF

b. Is measured in units of millivolts with the sign always designating the charge on the outside

c. Is less at the equilibrium potential for K+ than at resting membrane potential

d. Only a and b are correct

e. All of the above are correct

If an AXON were experimentally stimulated at both ends simultaneously

a. The action potential would pass in the middle and travel to the opposite ends.

b. The action potential would meet in the middle and then be propagated back to their starting positions.

c. The action potentials would stop as they met in the middle.

d. The strongest action potential would override the weaker action potential.

e. Summation would occur when the action potentials met in the middle, resulting in a larger action potential.

Choose the statement that is INCORRECT,

a. Once a steroid hormone binds with its intracellular receptor, the hormone-receptor complex binds with a specific hormone response element on DNA, thereby activating a particular gene.

b. The same chemical messenger may be either a hormone or a neurotransmitter, depending on its source and mode of delivery to the target tissue.

c. Steroid hormones are derived from cholesterol

d. With down regulation, one hormone induces the loss of another hormone’s receptors

Explanation / Answer

1.d.they determine the fluidity of the membrane

2.d.only a and b are correct

3.c.The action potential would stop as they met in the middle

4.d.With down regulation, one hormone induces the loss of another hormone’s receptors

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