Enzymes are a category of:
Proteins
Lipids
Nucleic acids
Carbohydrates
The Correct Answer is A
A. Proteins: Most enzymes are proteins (polypeptides) that catalyze biochemical reactions; a few enzymes are RNA molecules (ribozymes) but proteins are the predominant enzyme class.
B. Lipids: Lipids are structural and energy-storage molecules (fats, phospholipids) and are not the main class of enzymes.
C. Nucleic acids: Nucleic acids store and transmit genetic information; a minority of catalytic molecules (ribozymes) are RNA, but enzymes are chiefly proteins.
D. Carbohydrates: Carbohydrates provide energy and structural components (polysaccharides) and are not enzymes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Ectoderm: The ectoderm gives rise to the nervous system (including the brain and spinal cord) and epidermis.
B. Endoderm: The endoderm forms internal linings of the gut and associated organs (e.g., liver, lungs), not primary nervous tissue.
C. Mesoderm: The mesoderm produces muscle, bone, and the circulatory system, among other structures.
D. Epithelium: Epithelium is a tissue type, not a germ layer; epithelial tissues arise from one or more germ layers.
Correct Answer is B
Explanation
A. Muscle: Muscle tissue composes organs that generate force and movement, not the skin’s outermost layer.
B. Epithelial: The epidermis is made of stratified squamous epithelial cells and forms the skin’s outer layer.
C. Nervous: Nervous tissue (sensory nerve endings) is present in skin but is not the tissue that forms the outer surface.
D. Connective: The dermis is connective tissue beneath the epidermis and supports the outer layer, but it is not the outermost tissue.
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