During a chemical reaction in the human body, the ____________ causes the enzyme to be specific for that particular chemical reaction.
enzyme's active site
product
enzyme-substrate complex
None of the above are correct, because enzymes are not specific.
The Correct Answer is A
A. Enzyme's active site: The active site of an enzyme has a specific shape and chemical environment that matches the substrate, allowing the enzyme to bind only particular molecules and catalyze a specific chemical reaction efficiently.
B. Product: The product is the result of the reaction, not what determines the enzyme’s specificity. The enzyme’s structure dictates which substrate it can bind.
C. Enzyme-substrate complex: The enzyme-substrate complex forms after the substrate binds to the enzyme’s active site; it is a step in the reaction, not the determinant of specificity.
D. None of the above are correct, because enzymes are not specific: Enzymes are highly specific, with each enzyme typically catalyzing only one type of chemical reaction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Glucose: Glucose is the immediate form of sugar circulating in the blood and used by cells for energy. However, it is not stored in large amounts inside the liver or skeletal muscles, as excess glucose must be converted into a storage form.
B. Cholesterol: Cholesterol is a lipid molecule involved in cell membrane structure and hormone synthesis. It is not a storage form of carbohydrates and is handled differently in the body compared to sugars and glycogen.
C. Triglycerides: Triglycerides are the main storage form of fats found in adipose tissue. They serve as long-term energy reserves but are not the form in which carbohydrates are stored in the liver or muscles.
D. Glycogen: Glycogen is the storage form of carbohydrates in the body, primarily stored in the liver and skeletal muscle. It serves as a readily available energy reserve that can be broken down to glucose when blood sugar drops or energy demands increase.
Correct Answer is B
Explanation
A. Lateral: Lateral refers to a position away from the midline of the body. Both the patellar region (knee) and the tarsal region (ankle) are aligned along the midline of the lower limb, so lateral is not the correct directional term.
B. Proximal: Proximal means closer to the point of attachment or the trunk of the body. The patellar region is closer to the hip than the tarsal region, making proximal the correct anatomical relationship.
C. Medial: Medial describes a position closer to the midline of the body. Both the knee and ankle are centrally located along the limb, so medial does not properly distinguish their relative positions.
D. Distal: Distal refers to a point farther from the trunk or point of attachment. Since the tarsal region is farther from the hip than the patellar region, the knee cannot be described as distal to the ankle.
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