Why would vitamin A deficiency cause eye infections and blindness?
a. Vitamin A maintains epithelial cells
b. the mucus secreting cells damage the surface of the eye.
c. Keratin-producing cells decrease immune function.
d. the hard, dry surface protects normal epithelium
Answer: a. Vitamin A maintains epithelial cells
You might also like to view...
When the body experiences alkalosis, how do proteins help restore the acid-base balance?
A. Proteins speed the transfer of amine groups to new acid groups and side chains. B. Proteins uncoil and lose their shape. C. Proteins attract hydrogen ions and neutralize their effects. D. Proteins release hydrogen into the blood.
Which is the most common way to purify drinking water?
A. coagulants B. filters C. disinfection D. crystallization
Which of the following statements about minerals is true?
A. Minerals can be classified as major, trace, or minerals that may possibly be essential B. Minerals are organic nutrients C. Minerals provide approximately 3 kcal per gram consumed D. All elements are minerals
What is the structure of an enzyme?
a. Lipid b. Protein c. Nucleic acid d. Carbohydrate