1. ________ -tocopherol is the only tocopherol with vitamin E activity in the human body.a. alpha2. Which of the following statements regarding vitamin A's role in reproduction and growth is false?a. Retinal participates in sperm development3. Two hydroxylation reactions must occur before vitamin D becomes fully active. Which organ(s) is/are responsible for the hydroxylation reactions?a. kidneys and liver4. Which of the following statements about fat-soluble vitamins is false?a. The risk of toxicity from fat-soluble vitamins is less than it is for water-soluble vitamins5. Which of the following is a major role of vitamin A?a. all of these choices6. Which of the following statements is false regarding excessive intakes of vitamin A?a. Massive doses of vitamin A have beneficial effects on acne and are recommended for some adolescents.7. Scientists have identified oxidative stress as a causative factor in the development of all of the following diseases, except:a. gout8. Newborn infants are given a single dose of vitamin ________ at birth by intramuscular injection because they are born with a sterile intestinal tract.a. K9. Above ________ north latitude (and south latitude in the southern hemisphere), vitamin D synthesis essentially ceases for the four months of winter.a. 40°10. Which of the following factors may limit vitamin D synthesis?a. all of these choices11. About ________ percent of the U.S. population is either vitamin D deficient or their status is marginal.a. 3512. The ________ is covered by layers of epithelial cells.a. all of these choices13. Which of the following is not an environmental factor responsible for generating free radicals?a. Rain14. Proteins needing vitamin K's assistance have been associated with which of the following bodily roles?a. all of these choices15. Vitamin E is recognized for its many protective actions against chronic diseases. While toxicity is rare with vitamin E, the ________ carefully regulates body concentrations.a. Liver16. Vitamin D's special role in bone health is to assist in the absorption of calcium and ________ .a. Phosphorus17. Which form of vitamin A is the major transport and storage form of the vitamin?a. Retinol18. Bacteria in the GI tract provide about ________ of a person's need for vitamin K.a. Half19. Along with vitamin E, ________ is a key antioxidant nutrient.a. vitamin C20. Vitamin A supplementation may be helpful in protecting against complications of ________ .a. All of these choices21. Once synthesized, vitamin K is absorbed and stored in the ________ .a. Liver22. Which of the following statements regarding fat-soluble vitamin interaction is false?a. Vitamins A, D, and E play important roles in bone growth and remodeling.23. Which of the following statements about vitamin A's role in vision is true?a. Night blindness is caused by a lack of vitamin A at the back of the eye.24. Vitamin ________ is the fat-soluble vitamin the body can synthesize.a. D25. Which of the following is the best source of vitamin A per kcalorie?a. sweet potato26. In ________ , the bones fail to calcify normally, causing growth retardation and skeletal abnormalities in children.a. Rickets27. Which of the following conversions of vitamin A compounds is reversible?a. retinol to retinal28. Which of the following is a precursor for vitamin A?a. beta-carotene29. Most vitamin A is stored in which organ?a. Liver30. If a person were to stop eating vitamin A-containing foods, deficiency symptoms would not begin to appear until after stores were depleted; approximately ________ for a healthy adult.a. 1-2 days (I think mindtap stopped letting me fix this question- it’s not 1-2