How does the shape of proteins in muscle fibers affect their function?
A) They are wide, giving muscle fibers great tensile strength.
B) They are short, helping muscle fibers build up in response to weight-bearing exercise.
C) They are globular and can change shape to increase muscle mass.
D) They are long, allowing muscle fibers to contract and relax.
D
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Simone is looking for scientifically-supported information on nutrition, and performs an Internet search. Which criteria suggests that the site features unreliable information? a. The site states: "This website is authored and maintained by John Fawkes, M.D., a practicing physician who teaches at John Hopkins University School of Medicine." b. The latest post on the "recent news" page is dated
the day before. c. The site describes both potential risks and benefits when describing nutritional practices or products. d. The sources of statistics and study findings discussed are unavailable on the site. e. The summary information is presented in an objective manner.
What is the major energy carrier molecule in most cells?
a. ATP b. Glucose c. Pyruvate d. A kcalorie e. Acetyl CoA
There has been a dramatic improvement since the past decade in the status of most objectives for physical activity and fitness among adults
a. True b. False Indicate whether the statement is true or false
Which organ regulates the amount of glucose circulating in the blood by either synthesizing glycogen or breaking down glycogen?
a. kidneys b. gallbladder c. appendix d. thyroid e. liver