Vitamin A may be obtained by the body from precursors called ...

[RRMR]

Vitamin A may be obtained by the body from precursors called
 
  a. calciferols.
  b. carotenoids.
  c. rhodopsins.
  d. tocopherols.

Question 2

Vegetables are likely to be highest in vitamin C if they are
 
  a. boiled.
  b. canned.
  c. stir-fried.
  d. oven roasted.

[raenoj]

Answer to Question 1

B
The body can form vitamin A from carotenoids. Calciferols have vitamin D activity. Tocopherols have vitamin E activity. Rhodopsin is a substance formed from vitamin A in the retina.

Answer to Question 2

C
Vegetables are likely to be highest in vitamin C if they are stir-fried. Heat destroys vitamin C, so cooking for the minimum amount of time preserves vitamin C. Vitamin C is water-soluble, so cooking methods that use water cause loss of vitamin C into the cooking liquid. Stir-frying cooks vegetables quickly without adding water. Boiling and canning both cause loss of vitamin C be-cause of use of water. Oven roasting is a slow cooking method so more vitamin C is lost.

[RRMR]

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[raenoj]

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