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A buffer will

A.

enhance changes in the pH of solutions

B.

resist drastic changes in the pH of solutions

C.

have no effect on the pH of solutions

D.

make a solution more acidic

E.

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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Related Questions

Correct Answer is A

Explanation

A. nucleus; in the cytoplasm at the ribosomes
Transcription is the process of converting DNA to mRNA and occurs in the nucleus. Translation is the process of reading mRNA to synthesize proteins and occurs at the ribosomes, which are located in the cytoplasm (either free-floating or bound to rough ER).
B. nucleus; in the cytoplasm at the Golgi apparatus
Transcription occurs in the nucleus. But translation does not occur at the Golgi apparatus. The Golgi modifies, packages, and ships proteins, but does not synthesize them.
C. in the cytoplasm at the ribosomes; in the nucleus
This reverses the correct locations. Transcription is not in the cytoplasm, and translation is not in the nucleus.
D. in the cytoplasm at the ribosomes; in the rough endoplasmic reticulum
Transcription does not occur in the cytoplasm. While translation can occur on ribosomes attached to the rough ER, that’s a subset of ribosomes. The general location of translation is in the cytoplasm.

Correct Answer is A

Explanation

A. As body temperature rises, sweating occurs to cool the body:
An example of negative feedback, where the body counters a change to restore normal state.

B. After drinking large amounts of water, urine output decreases to raise blood volume:
Urine output would actually increase to excrete the excess water and maintain volume.

C. Decreases in blood pressure cause a corresponding decrease in heart rate:
A decrease in blood pressure should cause the heart rate to increase (compensatory response).

D. As blood pressure falls, blood flow to the heart decreases:
The body usually increases heart rate and vasoconstriction to maintain cardiac output.

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