During absorption in the small intestine, ____ cross the brush border cells, eventually ending up in the lymph vessels
a. simple sugars
b. fatty acids and glycerol
c. amino acids
d. nucleotides
e. complex sugars
ANSWER: b
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Folic acid supplements have become especially important for pregnant women because _____
A) folic acid supplies vitamins that only pregnant women can use B) the folic acid is stored in adipose tissue by pregnant women so supplements are needed to make more available in the circulation C) the fetus makes high levels of folic acid D) folic acid deprivation is associated with neural tube abnormalities in a fetus E) folic acid deprivation is a cause of heart abnormalities in a newborn
Which parts belong to the central nervous system?
A) sensory neurons B) interneurons C) motor neurons D) effectors
Isotopes are unstable and dissipate radioactive energy because they _____________
A. contain additional electrons in the electron orbital B. contain additional protons in the nucleus C. contain additional neutrons in the nucleus D. do not contain enough electrons in the electron orbital E. do not contain enough protons in the nucleus
Natural selection is the inevitable consequence of:
a. variation. c. differential reproductive success. b. inheritance. d. All of the above.