An organism with a temperature growth range of 45 to 60°C would be called
an extremophile.
thermoduric.
a facultative psychrophile.
a thermophile.
a psychrophile.
The Correct Answer is D
A. an extremophile: Extremophiles are organisms that thrive in extreme environmental conditions, such as very high or very low pH, salinity, or pressure. While thermophiles can be considered a type of extremophile, the term extremophile is broader and does not specifically describe organisms adapted primarily to high temperatures.
B. thermoduric: Thermoduric organisms are those that can survive short exposures to high temperatures but do not necessarily grow optimally at those temperatures. They are often heat-resistant spores or bacteria that survive pasteurization, rather than thriving at 45–60°C.
C. a facultative psychrophile: Facultative psychrophiles are organisms capable of growing at low temperatures but can tolerate higher temperatures. Their optimal growth range is typically below 20°C, making this classification inconsistent with a 45–60°C growth range.
D. a thermophile: Thermophiles are microorganisms that grow optimally at elevated temperatures, typically between 45°C and 80°C. They possess enzymes and cellular structures adapted to resist denaturation at high temperatures, which allows them to thrive in environments such as hot springs, compost piles, or industrial processes.
E. a psychrophile: Psychrophiles are cold-loving organisms that grow optimally at temperatures below 15°C and are adapted to Arctic, Antarctic, or deep-sea habitats. A growth range of 45–60°C is far beyond their tolerance, making this classification incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Guanine: Guanine pairs with cytosine in both DNA and RNA through three hydrogen bonds. It does not pair with uracil, as the chemical structure of uracil does not allow stable hydrogen bonding with guanine.
B. Adenine: In RNA, uracil replaces thymine and forms two hydrogen bonds with adenine. This base-pairing maintains the complementary structure needed for RNA transcription and folding, ensuring accurate coding during protein synthesis.
C. Thymine: Thymine is found only in DNA and pairs with adenine. In RNA, uracil substitutes for thymine, so thymine does not pair with uracil.
D. Cytosine: Cytosine pairs with guanine via three hydrogen bonds in both DNA and RNA. Cytosine does not pair with uracil because the hydrogen bonding does not match the structural requirements.
Correct Answer is B
Explanation
A. Allosteric site: The allosteric site is a region on the enzyme separate from the active site where regulatory molecules can bind. Binding at this site can change the enzyme’s conformation and alter its activity, either enhancing or inhibiting substrate binding, but the allosteric site does not directly interact with the substrate.
B. Active site: The active site is the specific region of the enzyme where the substrate binds. Its three-dimensional shape and chemical properties complement the substrate, allowing precise interaction. Binding at the active site facilitates the conversion of substrate to product, often stabilizing the transition state and lowering the activation energy of the reaction.
C. Induced fit site: The term “induced fit” describes the conformational change that occurs in the enzyme when the substrate binds to the active site, allowing tighter binding and optimal positioning for catalysis. It is not a separate site; rather, it refers to the dynamic adjustment of the active site itself.
D. Substrate attachment site: This is a general descriptive term and not a standard term in enzymology. The actual site where substrate molecules specifically bind is the active site, which is structurally and chemically tailored to the substrate.
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