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 A
Explanation
A. Residual volume and vital capacity: Total Lung Capacity (TLC) is the sum of every bit of air the lungs can hold. Vital capacity is the maximum air you can move, and residual volume is what remains after you exhale as hard as possible.
B. Tidal volume, inspiratory reserve volume, and expiratory reserve volume: This sum equals the vital capacity, but it misses the residual volume.
C. Residual volume and tidal volume: This is only a small portion of the total capacity.
D. Vital capacity and tidal volume: This is redundant, as tidal volume is already included within the calculation of vital capacity.
Correct Answer is B
Explanation
A. central canal: This is the space in the center of the spinal cord through which CSF flows, but it is not the primary site of formation.
B. choroid plexuses: These are networks of capillaries found in the ventricles of the brain specifically designed to filter blood and produce CSF.
C. subarachnoid space: This is the area where CSF circulates around the brain and spinal cord.
D. arachnoid villi: These are responsible for the reabsorption of CSF back into the blood, not its formation.
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