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 A
Explanation
A. Help in the formation of cell membranes: Lysosomes do not participate in building cell membranes. Their main role is to digest cellular waste, foreign particles, and damaged organelles, not to synthesize structural components like membranes.
B. Digesting particles taken in by endocytosis: Lysosomes contain hydrolytic enzymes that break down materials brought into the cell via endocytosis, helping the cell recycle nutrients and eliminate debris.
C. Degrading worn-out or nonfunctional organelles: Lysosomes perform autophagy, digesting damaged or obsolete organelles to maintain cellular health and prevent accumulation of dysfunctional components.
D. Breaking down bone to release calcium ions into the blood: Specialized lysosomes in osteoclasts secrete enzymes that degrade bone matrix, releasing calcium and phosphate ions into circulation, which is part of normal bone remodeling.
Correct Answer is A
Explanation
A. It allows a common point of reference for body position to help communicate anatomical relationships: Anatomical position standardizes the body orientation. This consistency allows healthcare professionals and anatomists to describe locations, directions, and relationships accurately.
B. It provides the greatest circulation to the extremities: Circulation is not determined by anatomical position. Blood flow is regulated by the cardiovascular system and body physiology, not the reference position for describing anatomy.
C. It is only viewed from a posterior position: Anatomical position is defined from a frontal perspective with the body facing forward. It is not limited to posterior viewing and applies to all directional and relational anatomical descriptions.
D. It is the position most comfortable to hospital patients: Anatomical position is not based on comfort but on creating a standardized reference. Patient comfort varies depending on medical condition, mobility, and treatment requirements.
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