Several of the molecules called vitamins act as enzyme cofactors. Vitamin deficiencies cause disease. What is the most direct explanation for this? a) If cofactors are missing, enzymes cannot function properly, and important reaction products will be absent from cells. b) Vitamins combine with nonprotein molecules to delay the onset of disease. c) Cofactors inhibit enzymes found in disease-causing bacteria and viruses. When cofact are absent, these disease-causing agents multiply. d) Normal regulation cannot occur in the absence of cofactors. As a result, all enzymes will function all of the time.

Organic And Biological Chemistry
7th Edition
ISBN:9781305081079
Author:STOKER, H. Stephen (howard Stephen)
Publisher:STOKER, H. Stephen (howard Stephen)
Chapter10: Enzymes And Vitamins
Section: Chapter Questions
Problem 10.43EP
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Several of the molecules called vitamins act as enzyme cofactors. Vitamin
deficiencies cause disease. What is the most direct explanation for this?
a) If cofactors are missing, enzymes cannot function properly, and important
reaction products will be absent from cells.
b) Vitamins combine with nonprotein molecules to delay the onset of disease.
c) Cofactors inhibit enzymes found in disease-causing bacteria and viruses.
When cofactors are absent, these disease-causing agents multiply.
d) Normal regulation cannot occur in the absence of cofactors. As a result, all
enzymes will function all of the time.
Transcribed Image Text:Several of the molecules called vitamins act as enzyme cofactors. Vitamin deficiencies cause disease. What is the most direct explanation for this? a) If cofactors are missing, enzymes cannot function properly, and important reaction products will be absent from cells. b) Vitamins combine with nonprotein molecules to delay the onset of disease. c) Cofactors inhibit enzymes found in disease-causing bacteria and viruses. When cofactors are absent, these disease-causing agents multiply. d) Normal regulation cannot occur in the absence of cofactors. As a result, all enzymes will function all of the time.
Tight junctions are cell-cell junctions found between adjacent cells of the epithelium
that lines the small intestine. What is the function of these cellular junctions?
a) to recognize pathogenic organisms present in the lumen of the small
intestine
b) to seal the epithelium and prevent movement of substances between cells
O c) to attach epithelial cells to a basement membrane
d) to release digestive enzymes into the intestinal lumen
Transcribed Image Text:Tight junctions are cell-cell junctions found between adjacent cells of the epithelium that lines the small intestine. What is the function of these cellular junctions? a) to recognize pathogenic organisms present in the lumen of the small intestine b) to seal the epithelium and prevent movement of substances between cells O c) to attach epithelial cells to a basement membrane d) to release digestive enzymes into the intestinal lumen
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