A buffer will

enhance changes in the pH of solutions

resist drastic changes in the pH of solutions

have no effect on the pH of solutions

make a solution more acidic

make a solution more basic

Answer and Explanation

The Correct Answer is B

A. enhance changes in the pH of solutions: A buffer does the opposite-it prevents drastic pH changes.
B. resist drastic changes in the pH of solutions: Buffers help maintain stable pH by neutralizing excess acids or bases (e.g., bicarbonate buffer system in blood).
C. have no effect on the pH of solutions: Buffers do affect pH-they stabilize it.
D. make a solution more acidic: Buffers don’t always make solutions acidic; they can neutralize both acids and bases.
E. make a solution more basic: Same rationale-buffers do not push pH in one direction, they resist change.

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Correct Answer is B

Explanation

A. voltage gated ion channels: These open in response to changes in membrane potential, not chemical binding.
B. ligand gated ion channels: Ligands (like neurotransmitters) bind to the channel, causing it to open or close.
C. G-protein complex linked receptor proteins: These are receptors that activate intracellular signaling cascades, not ion channels directly.
D. carrier proteins: Carrier proteins transport substances across membranes but do not form open channels.

A. quarternary B. primary C. secondary D. tertiary

Correct Answer is D

Explanation

A. quaternary: Quaternary structure involves the interaction of multiple polypeptide chains, not folding of a single chain.
B. primary: Primary structure is the linear sequence of amino acids.
C. secondary: Secondary structure includes alpha helices and beta-pleated sheets, but not their 3D folding.
D. tertiary: Tertiary structure is the 3D shape formed by the folding of secondary structures, stabilized by hydrogen, ionic, and disulfide bonds.

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A buffer will

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Naxlex Comprehensive Predictor Exams

Channels that open due to a compound binding to receptor sites on the extracellular surface of the channels would be considered: non gated ion channels

Correct Answer is B

Explanation

This protein structure results from the folding in of the alpha helix or pleated sheet.

Correct Answer is D

Explanation

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