What changes occur in the sarcomere during muscle contraction?
A. A band decreases in length.
B. The thin filament shortens.
C. I band increases in length.
D. Z discs move closer together.
Answer: D. Z discs move closer together.
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List three food sources rich in vitamin D.
What will be an ideal response?
Protein, carbohydrates, fats, water, vitamins and minerals make up the six classes of nutrients.
a. true b. false
What is known about molybdenum?
a. molybdenum plays an important role in regulating blood pressure. b. molybdenum deficiency has been frequently reported in the scientific journals c. a recommended dietary allowance (RDA) has not yet been established for molybdenum. d. molybdenum in food varies with its content of the soil where the food is produced
Why are pharmaceutical companies less willing to fund research on plants for medicinal purposes than on man-made medicines?
a. Because there isn't enough land to cultivate the plants in sufficient quantities. b. Because past research has not lead to any useful medicines. c. The statement is untrue and there is a lot of research going on. d. Because the plants cannot be patented to allow exclusivity for any profits.