Which lipid is part of vitamin D?
Glycerol
Steroids
Prostaglandins
Fatty acids
The Correct Answer is B
A. Glycerol: This is a component of triglycerides, not Vitamin D.
B. Steroids: Vitamin D is a fat-soluble vitamin synthesized from cholesterol (a steroid) in the skin when exposed to UV light.
C. Prostaglandins: These are tissue hormones derived from fatty acids, not vitamins.
D. Fatty acids: While Vitamin D is fat-soluble, its chemical structure is classified as a secosteroid.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. They accelerate chemical reactions: This is true; enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. They change chemically and are in the end products: Catalysts are not consumed or permanently altered by the reaction; they are released to be used again.
C. They are vital to chemical reactions: Most metabolic processes would occur too slowly to sustain life without them.
D. Many contain vitamins in their structure: Many enzymes require cofactors or coenzymes (often derived from vitamins) to function.
Correct Answer is C
Explanation
A. hemoglobin: This is the iron-containing protein within the cell that carries oxygen, not the cell itself.
B. osteons: These are the structural units of compact bone, unrelated to blood cell production.
C. erythroblasts: These are the immature, nucleated cells in the red bone marrow that eventually synthesize hemoglobin and eject their nuclei to become reticulocytes and then mature erythrocytes.
D. hematopoietic stem cells: While all blood cells originate here, the specific maturation sequence for red blood cells specifically identifies erythroblasts as the intermediate nucleated stage.
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