Which of the following is not true of enzymes?
They accelerate chemical reactions.
They change chemically and are in the end products of the reaction.
They are vital to chemical reactions.
Many contain vitamins in their structure.
The Correct Answer is B
A. They accelerate chemical reactions: This is true; enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. They change chemically and are in the end products: Catalysts are not consumed or permanently altered by the reaction; they are released to be used again.
C. They are vital to chemical reactions: Most metabolic processes would occur too slowly to sustain life without them.
D. Many contain vitamins in their structure: Many enzymes require cofactors or coenzymes (often derived from vitamins) to function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Isotonic: In an isotonic contraction, the muscle changes length to move a load. If the object is too heavy to lift, no movement occurs.
B. Flaccid: Flaccid refers to a lack of muscle tone (limpness), which is not the state of a muscle trying to lift a heavy weight.
C. Treppe: Treppe (the "staircase effect") refers to an increase in the force of contraction when a muscle is stimulated repeatedly after relaxation.
D. Isometric: An isometric contraction occurs when tension increases in the muscle, but the muscle does not shorten because the load is too great to move.
Correct Answer is D
Explanation
A. a relative lack of ATP: ATP is required for the cross-bridge cycle; a deficiency prevents muscle contraction and relaxation.
B. high levels of lactate: Anaerobic respiration leads to lactic acid buildup, which lowers pH and interferes with enzyme activity and calcium binding.
C. failure of the sodium-potassium pumps: Ion imbalances caused by pump failure prevent the muscle membrane from repolarizing correctly.
D. all of the above: Muscle fatigue is a complex process caused by the combination of energy depletion, chemical buildup, and ion imbalances.
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