All of the following describes enzymes, except
enzymes are made of protein
enzymes can be denatured
enzymes can only work one time
enzymes can be found in biological organisms
The Correct Answer is C
A. Enzymes are made of protein: Enzymes are primarily composed of protein molecules that fold into specific three-dimensional shapes, enabling them to catalyze biochemical reactions efficiently.
B. Enzymes can be denatured: Enzymes can lose their functional shape, or become denatured, when exposed to extreme temperatures, pH levels, or chemical agents, which impairs their catalytic activity.
C. Enzymes can only work one time: Enzymes are not used up in reactions; they can catalyze the same type of reaction repeatedly without being consumed.
D. Enzymes can be found in biological organisms: Enzymes are naturally present in all living organisms, where they facilitate essential metabolic and physiological processes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Have no cell walls: Mycoplasmas lack a rigid cell wall, which allows them to adopt variable shapes, making them pleomorphic. Without a cell wall, they are more flexible and can change form depending on environmental conditions.
B. Produce endospores: Endospore production is a survival mechanism seen in genera like Bacillus and Clostridium. Mycoplasmas do not produce endospores.
C. Exhibit snapping division: Snapping division is a method of reproduction in some bacteria like Corynebacterium, but it does not cause the broad variability in shape observed in Mycoplasmas.
D. Have sterols in their cytoplasmic membranes: Sterols provide structural support to stabilize the flexible membrane of Mycoplasmas, but pleomorphism results primarily from the absence of a rigid cell wall rather than sterol presence.
Correct Answer is D
Explanation
A. Determine the type of yeast that would produce the best tasting wine: This relates to fermentation studies, particularly those of Louis Pasteur, rather than Koch’s postulates, which focused on linking specific microbes to specific diseases.
B. Determine why milk spoils: Milk spoilage investigations are associated with Pasteur’s work on microbes and pasteurization. Koch’s postulates were designed to establish causation between microbes and disease, not food preservation.
C. Disprove spontaneous generation: Disproving spontaneous generation was a key goal of Pasteur’s experiments using sterilized broths and flasks. Koch’s postulates, in contrast, provided a method to prove microbial causes of disease.
D. Prove the identity of the microbe that caused a disease: Koch’s postulates were developed to establish a clear, systematic method for identifying the specific microorganism responsible for a particular disease. This framework allowed scientists to link pathogens to illnesses with scientific rigor.
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