In the context of vision, one of the differences between rod cells and cone cells is that unlike the rod cells, the cone cells:
A) are not important for clear vision.
B) enable you to distinguish black from white.
C) enable you to see color.
D) are not located in the retina.
Q. 2Which of the following is true of the water-soluble vitamins?
A) Their overconsumption does not lead to toxic effects.
B) They are absorbed in the large intestine.
C) They are not circulated in the blood.
D) Their chemical structures are similar to each other.
Q. 3Which of the following is true of vitamin E?
A) Its ability to act as an antioxidant is inhibited by the presence of vitamin C.
B) Its ability to act as an antioxidant is inhibited by the presence of selenium.
C) It plays a major role in the maintenance of the biological membranes.
D) It acts as a coenzyme in the formation of blood clots and coagulation.
Q. 4Which of the following is true of fat-soluble vitamins?
A) They are absorbed mostly in the large intestine.
B) They are absorbed mostly in the small intestine.
C) They are not stored by the body.
D) They are not toxic even at high doses.
Q. 5Which of the following foods are good sources of carotenoids?
A) Onions
B) Nuts and raisins
C) Potatoes
D) Carrots and peppers
Q. 6Which of the following vitamins can be recommended to a person to improve his or her iron absorption in the body?
A) Vitamin B2
B) Vitamin A
C) Vitamin B1
D) Vitamin C
Q. 7The process by which blood clots form is known as__________.
A) hyperkeratosis
B) hemolysis
C) coagulation
D) malabsorption
Q. 8Which of following vitamins present in milk is destroyed on exposure to excessive light?
A) Riboflavin
B) Niacin
C) Thiamin
D) Pantothenic acid
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