Concerning molecules in the cell membrane, which of the following is most correc

Question

Concerning molecules in the cell membrane, which of the following is most correctly matched?
A) phospholipid molecules – hydrophobic heads, hydrophilic tails; proteins – carriers, enzymes,
receptors, pores; carbohydrate – outer surface, cell type identification; cholesterol – between
phospholipid molecules B) carbohydrate – bilayer, framework of the cell membrane; proteins –
carriers, enzymes, receptors; cholesterol – between phospholipid molecules C) proteins –
hydrophobic tails, hydrophilic heads; phospholipids – carriers, enzymes; carbohydrate – between
phospholipid molecules D) cholesterol – carriers, enzymes; carbohydrate – bilayer, framework of
cell membrane; proteins-outer surface, cell type identification; phospholipid – between carbohydrate
molecules E) phospholipid molecules – bilayer, framework of the cell membrane; proteins –
carriers, enzymes, receptors, pores; carbohydrate – outer surface, cell type identification; cholesterol –
between phospholipid molecules

Which of the following molecule(s) would enter or leave the cell by diffusing though the membrane
bilayer? A) CO2 B) O2 C) steroid hormones D) all of these because they are nonpolar molecules
E) none of these because they are charged or polar molecules

Select the LEAST correct or NOT a correct statement. The function of this question is to have you review Membrane Potentials. A) Resting membrane potential is closer to the equilibrium potential for K+ than the equilibrium potential for Na+ B) Summation can occur during an action potential. C) In demyelinating diseases, conduction can be slowed or blocked in areas without myelin. D) A suprathreshold stimulus can or could cause a response during the relative refractory period. E) Saltatory conduction increases impulse velocity because action potentials only occur where myelin is absent (not present).

Explanation / Answer

1. Correct answer:- (E)

2 correct answer:- (D) all of these

3. Correct answer:- (E)

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