When a _____inhibitor molecule binds to an allosteric site on an enzyme, the shape of the active site changes so that the substrate molecules can no longer fit.
competitive
non-competitive
The Correct Answer is B
A. Competitive: A competitive inhibitor binds at the active site, directly competing with the substrate for binding and does not change the active site shape by binding elsewhere.
B. Non-competitive: A non-competitive inhibitor binds at an allosteric (different) site, inducing a conformational change in the enzyme that alters the active site so the substrate can no longer bind effectively.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. True: Ionizing radiation (gamma rays, X-rays) penetrates deeply and causes ionizations that break DNA and other critical molecules, making it generally more effective at inactivating microbes and spores than nonionizing UV, which has more limited penetration.
Correct Answer is D
Explanation
A. rRNA only: Some genes encode ribosomal RNA, but not all genes are limited to rRNA.
B. tRNA only: Some genes encode transfer RNA, but genes can encode other RNA types or proteins as well.
C. mRNA and polypeptide only: Some genes encode mRNA that is translated into polypeptides, but genes also encode functional RNAs that are not translated.
D. Any of the above: A gene can encode rRNA, tRNA, or mRNA (which may be translated into a polypeptide), so any of these products can be specified by different genes.
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