How does the shape of proteins in muscle fibers affect their function?
A. They are globular and can change shape to increase muscle mass.
B. They are long, allowing muscle fibers to contract and relax.
C. They are short, helping muscle fibers build up in response to weight-bearing exercise.
D. They are wide, giving muscle fibers great tensile strength.
Answer: B
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In the current Dietary Guidelines for Americans, the nutrients to limit include
A) fat-soluble vitamins. B) sodium. C) protein. D) carbohydrates.
The development of facial and heart defects in the fetus has been linked to _____ in the mother
a. excessive vitamin A intake b. iron deficiency c. high blood levels of lead d. obesity e. folate deficiency
Which of the following is NOT among the dietary recommendation for children?
a. Children ages 4-18 years should consume at least 25% fat energy b. Children with high blood cholesterol should be treated first with statin drugs c. Children ages 1-2 years who are obese should consume reduced-fat milk rather than whole milk d. Children ages 1-2 years need an amount of fat to support their growth that is much higher than 25% fat energy
A block in the urea cycle can result from a deficiency in any of these enzymes except:
a. glucokinase. b. carbamyl phosphate synthetase I. c. arginase. d. argininosuccinic acid lyase.