Inducible enzymes
are synthesized only when their substrate is available
are synthesized continuously be the cell
are only found in prokaryotes
are coded by genes that are always expressed
The Correct Answer is A
A. Are synthesized only when their substrate is available: Inducible enzymes are produced in response to the presence of a substrate or inducer (e.g., the lac operon enzymes are synthesized when lactose is present), conserving cellular resources until needed.
B. Are synthesized continuously by the cell: Constitutive enzymes are synthesized continuously regardless of substrate presence; this statement describes constitutive rather than inducible enzymes.
C. Are only found in prokaryotes: Inducible regulation of enzyme synthesis occurs in both prokaryotes and eukaryotes; it is not exclusive to prokaryotes.
D. Are coded by genes that are always expressed: Genes that are always expressed encode constitutive enzymes; inducible enzyme genes are typically regulated and expressed only under inducing conditions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. Dry heat at 170 °C for 2 hours: Extended dry heat at this temperature effectively destroys endospores by oxidizing cellular components.
B. Incineration: Complete burning destroys all microbial life, including endospores, making it a reliable sterilization method.
C. Glutaraldehyde for 3 or more hours: Prolonged exposure to glutaraldehyde, a high-level disinfectant, can inactivate endospores.
D. Ethylene oxide for 3 or more hours: Ethylene oxide gas sterilization penetrates materials and effectively kills endospores.
E. All of the choices are correct: Each of these methods can destroy endospores under proper conditions, so this option accurately includes all effective methods.
Correct Answer is B
Explanation
B. False: Endospores are highly resistant to heat and other stresses; because microwaves can heat unevenly and may not achieve sterilizing conditions, reheating food in a microwave does not reliably kill bacterial endospores.
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