The body can synthesize a provitamin from dietary cholesterol and store it in skin. With exposure to ultraviolet light, this provitamin is changed to an inactive form of vitamin ________.
Fill in the blank(s) with the appropriate word(s).
Answer: D
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Nicotine poisoning differs from muscarine poisoning in that
A) it causes vomiting. B) it causes salivation. C) it causes sweating. D) it causes skeletal muscle convulsions. E) it causes diarrhea.
Hemoglobins are
A) Red. B) Blue. C) Clear. D) Green.
During total heart block in the frog, ________
A) the atria and the ventricle continue to beat, but they beat independently of each other B) the atria and the ventricle continue to beat, but the atria beat slower than the ventricle C) the heart continues to beat in normal rhythm D) the atria continue to beat, but the ventricle ceases beating
A patient is born with several autoimmune diseases and severe allergies. This patient most likely has a deficiency of ________.
A. helper T cells B. regulatory T cells C. plasma cells D. cytotoxic T cells