What part of the digestive system has the most surface area for the absorption of nutrients?

A) esophagus
B) stomach
C) small intestine
D) large intestine


C

Biology & Microbiology

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Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?  

A.  TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans. B.  The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans. C.  Viroids are the likely cause of TSEs. D.  TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases. E.  Infectious TSE preparations do not seem to contain DNA or RNA.

Biology & Microbiology

Which of the following is sometimes useful against viral infections?

A. Azidothymidine B. Streptomycin C. Rifampin D. Trimethoprim

Biology & Microbiology

In some parts of Africa, the frequency of heterozygosity for the sickle-cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following?

A) Mendel's law of independent assortment B) Mendel's law of segregation C) Darwin's explanation of natural selection D) the malarial parasite changing the allele

Biology & Microbiology

The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ________ urine.

A. hypertonic B. hypotonic C. isotonic D. osmolar

Biology & Microbiology