The lymphatic vessels in the villi absorb and transport __________.
a. fats
b. monosaccharides
c. amino acids
d. chylomicrons
e. peptides
Answer: d. chylomicrons
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Glycogen stored in muscles can be "mobilized" to supply metabolic energy by hydrolyzing individual glucose subunits from the polymer. What other organ has a major function of storing glycogen?
A. liver B. brain C. stomach D. large intestine
The enzyme reverse transcriptase synthesizes:
A. DNA from RNA. B. RNA from DNA. C. proteins from RNA. D. proteins from DNA. E. double-stranded RNA from doublestranded DNA.
A repair enzyme recognizes an incorrect structure in the DNA and directly converts it back to a correct structure. Which of the following DNA repair systems is responsible for the correction?
A. base excision repair B. direct repair C. indirect repair D. nucleotide excision repair E. methyl-directed mismatch repair
Dissimilative sulfur-reducing bacteria are incapable of reducing
a. ferrous iron (Fe2+). b. nitrate (NO3–). c. thiosulfate (S2O32–). d. sulfate (SO42–).