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 A
Explanation
A. Eurytolerant: Refers to organisms that can survive and grow under a wide range of environmental conditions (e.g., temperature, pH, salinity).
B. Stenotolerant: Opposite of eurytolerant; can survive only within a narrow range of conditions.
C. Obligate: Indicates a strict requirement for a particular condition (e.g., obligate aerobe requires oxygen).
D. Facultative: Indicates flexibility with respect to certain conditions (e.g., facultative anaerobes can
Correct Answer is D
Explanation
A. Work best against Gram-negative bacteria: Surfactants disrupt membranes, and Gram-negative bacteria have an outer lipid membrane that is particularly susceptible.
B. Dissolve membrane lipids: Surfactants break down lipid layers in membranes, leading to cell lysis and death.
C. May also be called detergents: Surfactants are often referred to as detergents because of their ability to reduce surface tension and emulsify lipids.
D. All of the above: Surfactants perform all these actions, making this choice the most comprehensive description.
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