At temperatures higher than the maximum growth temperature for an organism,
proteins are permanently denatured.
membranes become too fluid for proper function.
hydrogen bonds within molecules are broken.
hydrogen bonds are broken and proteins are permanently denatured.
hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.
The Correct Answer is E
A. Proteins are permanently denatured: Heat can denature proteins by disrupting noncovalent interactions; however, saying “permanently” is too absolute — some proteins may refold if conditions return to normal.
B. Membranes become too fluid for proper function: Elevated temperatures increase membrane fluidity (phospholipid tails become more disordered), impairing membrane integrity and function. This is true but incomplete alone.
C. Hydrogen bonds within molecules are broken: High temperature disrupts hydrogen bonds (and other weak interactions) that stabilize protein secondary/tertiary structure and nucleic acids; again this is true but incomplete by itself.
D. Hydrogen bonds are broken and proteins are permanently denatured: This combines two effects (bond disruption and denaturation). It’s closer, but “permanently” may be incorrect in some cases where refolding is possible — and it still omits membrane effects.
E. Hydrogen bonds are broken, proteins are denatured, and membranes become too fluid: High temperatures disrupt hydrogen bonding, cause protein denaturation, and increase membrane fluidity, all of which together explain why growth stops above the maximum growth temperature.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is A,D,C,E,B
Explanation
A) Inoculate — This is the first step in culturing microorganisms. The specimen or sample is introduced (inoculated) into a growth medium (solid or liquid) under sterile conditions to encourage microbial growth.
D) Incubate — After inoculation, the culture is placed in an incubator under suitable conditions of temperature, humidity, and atmosphere to allow growth.
C) Isolate — Once growth is visible, specific colonies are separated (isolated) to obtain pure cultures. This allows studying a single species of microorganism.
E) Inspect — The isolated colonies are then visually inspected (using naked eye or microscope) for morphological characteristics such as shape, color, size, and pattern.
B) Identify — Finally, biochemical, molecular, or serological tests are performed to identify the organism based on its characteristics.
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