The Correct Answer is {"dropdown-group-1":"D"}
A. Spectrin: This is a cytoskeletal protein that gives red blood cells their flexibility.
B. Erythropoietin: This is a hormone produced by the kidneys that stimulates the production of red blood cells.
C. Serum: Serum is the liquid portion of blood that remains after a clot has formed; it does not prevent clotting.
D. Heparin: Heparin is a natural anticoagulant produced by basophils and mast cells that inhibits the action of thrombin to prevent intravascular clotting.
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Naxlex Comprehensive Predictor Exams
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Correct Answer is B
Explanation
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.
Correct Answer is D
Explanation
A. carbon: Carbon is the "backbone" of all organic molecules, found in both proteins and carbohydrates.
B. hydrogen: Hydrogen is present in all organic molecules, including both proteins and carbohydrates.
C. oxygen: Oxygen is a key component of both proteins and carbohydrates.
D. nitrogen: Proteins are made of amino acids, which contain an amino group (-NH2). While carbohydrates typically only contain C, H, and O, nitrogen is a defining element for proteins.
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