Cell membranes are susceptible to damage by free radicals because
A. they have so many unpaired electrons.
B. they contain many polyunsaturated fatty acids.
C. they contain many saturated fatty acids.
D. they are the site of cellular respiration.
Answer: B
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Think back to Rose’s story about her transition from being barely able to run one mile, to eventually running a marathon. What physiological adaptations took place that made this athletic feat possible?
In the United States, how much cropland is used to produce feed for livestock?
a. less than what is used to produce grain for people b. more than what is used to produce grain for people c. more than the size of the whole continent of Africa d. less than what is needed to feed all the people of Europe e. more than the surface area of all the oceans combined
What percentage of a person’s ingested energy intake is required to convert excess dietary fat to body fat?
a. 5 b. 15 c. 25 d. 35 e. 45
How does the use of substances such as alcohol, tobacco, and recreational drugs affect the nutritional status of adolescents?
What will be an ideal response?