Which of the following is true about vitamin D3 (cholecalciferol)? A. It is a sterol. B. It is a hormone precursor. C. Humans enzymatically synthesize their own Vitamin D3. D. It is converted into a biologically active form by UV light from sunlight.

What is the advantage of adding urea to feed in some cattle diets? Select one: a. It helps reduce CH3 production and hence the amount of eructation which contributes to global warming b. It helps stimulate kidney activity to help reduce blood toxins c. Urea helps control the growth of unwanted fungi and protists d. It is a cheap way to increase protein production by rumen symbionts

What is one of the major pathways by which excess cholesterol is eliminated from circulation? Select one: a. As VLDL b. Using anti cholesterol drugs c. In feces d. Conversion to chylomicrons e. Conversion to bile salts

The enzyme that converts 3-phosphoglycerate to 2-phosphoglycerate is a A. transferase. B. kinase. C. mutase. D. phosphorylase.

In addition to vitamin E succinate, which other fat-soluble vitamin has been shown to make lysosomal membranes more unstable and vulnerable to rupture (when consumed in large doses)? A. vitamin A (in the form of retinoic acid) B. vitamin B12 (in the form of cyanocobalamin) C. vitamin B2 (in the form of riboflavin) D. vitamin C (in the form of ascorbic acid) E. vitamin B1 (in the form of thiamine)