All of the following describe(s) an enzyme, except
An enzyme speeds up a chemical reaction in living organisms.
An enzyme is a biological catalyst.
An enzyme reacts with the reactants and becomes part of the products.
An enzyme is specific to the chemical reaction it catalyzes.
The Correct Answer is C
A. An enzyme speeds up a chemical reaction in living organisms: Enzymes function as catalysts by lowering the activation energy needed for reactions, allowing biological processes to occur more quickly and efficiently.
B. An enzyme is a biological catalyst: Enzymes are proteins that serve as catalysts in living systems, regulating the speed of biochemical reactions without being permanently altered.
C. An enzyme reacts with the reactants and becomes part of the products: Enzymes do not become part of the products; they bind substrates temporarily, facilitate the reaction, and are released unchanged, allowing them to be reused multiple times.
D. An enzyme is specific to the chemical reaction it catalyzes: Enzymes have a highly specific active site that matches particular substrates, making them selective for certain reactions or molecular interactions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. growing corn plants with various amounts of fertilizer: Using corn plants introduces a different species, which makes results irrelevant to the effect of fertilizer on tomato plants.
B. growing tomato plants with various amounts of fertilizer: This is part of the experimental group rather than a control, as it tests different fertilizer levels rather than providing a baseline for comparison.
C. growing corn plants without fertilizer: Corn plants are not suitable because the research question focuses on tomato plants. A valid control must match the species being studied.
D. growing tomato plants without fertilizer: This is the correct control, as it provides a baseline growth rate for tomato plants without fertilizer, allowing meaningful comparison with fertilized groups.
Correct Answer is C
Explanation
A. Staphylococcus: Staphylococcus species are Gram-positive cocci that possess thick peptidoglycan cell walls, giving them rigidity and shape. They do not naturally lack a cell wall.
B. Bacillus: Bacillus species are Gram-positive, rod-shaped bacteria with strong cell walls. They are also capable of forming endospores but are not wall-deficient.
C. Mycoplasma: Mycoplasma species naturally lack a cell wall, relying on sterols in their cell membrane for structural support. This absence makes them pleomorphic and resistant to antibiotics like penicillin that target cell wall synthesis.
D. Clostridium: Clostridium species are Gram-positive rods with thick cell walls and the ability to produce endospores. They do not naturally exist without a cell wall.
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