Understanding Nutrition 12th Edition By Whitney – Test Bank

Overview

Chapter 11
The Fat-Soluble Vitamins: A, D, E, and K

An. Page(s)/difficulty K = knowledge-level, A = application level

Multiple Choice Questions

Questions for Section 11.0 Introduction

c 355(A) 01. Which of the following is not among the features of the fat-soluble vitamins?
a. Require bile for absorption
b. Found in the fat and oily parts of foods
c. Transported permanently to the liver and adipose tissue
d. Pose a greater risk for developing a toxicity than water-soluble vitamins

c 355(K) 02. What is the major carrier of the fat-soluble vitamins from the intestinal epithelial cell to the circulation?
a. Albumin
b. Cholesterol
c. Chylomicrons
d. Liposoluble binding proteins

c 355(K) 03. Which of the following is a property of the fat-soluble vitamins?
a. Most of them are synthesized by intestinal bacteria
b. Intestinal transport occurs by way of the portal circulation
c. Deficiency symptoms may take years to develop on a poor diet
d. Toxicity risk is higher for vitamins E and K than for other fat-soluble vitamins

Questions for Section 11.1 Vitamin A and Beta-Carotene

d 355(A) 04. If the diet contains precursor vitamin A, which of the following tissues can use it to form vitamin A?
a. Eyes
b. Kidneys
c. Adipose cells
d. Intestinal cells

d 355(K) 05. Which of the following food substances can be converted to vitamin A in the body?
a. Tryptophan
b. Chlorophyll
c. Xanthophyll
d. Beta-carotene

c 355(K) 06. How many different forms of vitamin A are active in the body?
a. 1
b. 2
c. 3
d. 5

d 355(K) 07. All of the following are forms of vitamin A except
a. retinol.
b. retinal.
c. retinoic acid.
d. retinoquinone.

c 356(K) 08. Which of the following is responsible for transporting vitamin A from the liver to other tissues?
a. Albumin
b. Rhodopsin
c. Retinol-binding protein
d. Transcarotenoid protein

a 356-358(A) 09. As far as is known, vitamin A does not play an important role in which of the following processes?
a. Blood clotting
b. Growth of bones and teeth
c. Synthesis of visual pigment
d. Maintaining mucous membranes

b 356-357(A) 10. What are the known effects of raising animals on diets containing retinoic acid as the only source of vitamin A?
a. Growth is stunted
b. Blindness develops
c. Retinal synthesis is stimulated
d. Retinol synthesis is stimulated

b 357(K) 11. Which of the following describes an association of vitamin A and vision?
a. Retinoic acid is the form required for synthesis of retinoblasts
b. Light causes retinal to shift from a cis to a trans configuration
c. Retinol is the form bound to beta-carotene in the corneal membrane
d. Pigment molecules in the retina are composed of a molecule of vitamin A bound to an omega-3 fatty acid

c 357(K) 12. Which of the following is the name of the vitamin A compound that is active in the visual response?
a. Opsin
b. Keratin
c. Retinal
d. Carotene

a 357(K) 13. Which of the following describes an event in the visual response process?
a. Light energy strikes the retina and excites pigments to release retinal
b. Light energy strikes the cornea and excites pigments to release retinoic acid
c. Visual pigments deep in the brain are excited by light transmitted through the retina
d. Epithelial cells on the surface of the eye respond to light energy by transmitting opsin molecules along nerve pathways to the brain

d 358(K) 14. Approximately what percent of the body’s vitamin A stores are found in the liver?
a. 20
b. 50
c. 70
d. 90

a 358(K) 15. What tissue contains the majority of the body’s store of vitamin A?
a. Liver
b. Adipose
c. Retinal cells
d. Intestinal mucosal cells