3. Which is NOT a common step in process of receptor-mediated endocytosis? a. Ho
ID: 204477 • Letter: 3
Question
3. Which is NOT a common step in process of receptor-mediated endocytosis?
a. Hormones bind to receptor
b. Hormone-receptor complex is taken into the cell via endocytosis
c. Hormone is separated from the receptor and ultimately activates genetic systems of the cell leading to a cellular response(s).
d. Hormone is recycled back into the cell membrane
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.
2. Assume a hypothetical postsynaptic neuron has three presynaptic inputs: X, Y and Z. Also assume that presynaptic neuron Z is excitatory.
2a) If presynaptic neuron X is stimulated, the postsynaptic cell membrane becomes slightly hyperpolarized. What kind of a synapse is involved between presynaptic neuron X and the postsynaptic neuron?
a) Excitatory synapse.
b) Inhibitory synapse.
c) It could be either an excitatory or an inhibitory synapse.
d) Collateral axoaxonic.
e) Insufficient information is given to know what kind of synapse is involved.
2b: If presynaptic neuron Y is stimulated, the postsynaptic cell membrane becomes slightly depolarized. What kind of synapse is involved between presynaptic neuron Y and postsynaptic neuron?
a) Excitatory synapse.
b) Inhibitory synapse.
c) It could be either an excitatory or an inhibitory synapse.
d) Collateral axoaxonic.
e) Insufficient information is given to know what kind of synapse is involved.
The phospholipids within the plasma membrane
a. form a bilayer with the nonpolar tails buried in the center and the hydrophilic heads lined up on the outer and inner surfaces.
b. serve as a barrier to passage of most water-soluble substances between the ICF and ECF.
c. form channels for passage of small ions
d. Both A and B above are correct.
e. All of the above are correct.
Explanation / Answer
3. Which is NOT a common step in process of receptor-mediated endocytosis?
Answer: d. Hormone is recycled back into the cell membrane
Which of the following is NOT a function of membrane proteins?
Answer: They determine the fluidity of the membrane
2a) If presynaptic neuron X is stimulated, the postsynaptic cell membrane becomes slightly hyperpolarized. What kind of a synapse is involved between presynaptic neuron X and the postsynaptic neuron?
Answer: Inhibitory synapse
2b: If presynaptic neuron Y is stimulated, the postsynaptic cell membrane becomes slightly depolarized. What kind of synapse is involved between presynaptic neuron Y and postsynaptic neuron?
Answer: Excitatory Synapse
The phospholipids within the plasma membrane
Answer: b. serve as a barrier to passage of most water-soluble substances between the ICF and ECF
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