What is the most common reason that vitamin B12 deficiency, or at least compromised B12 status, occurs in older adults?
a. Diets are frequently low in vitamin B12, since oral problems and financial difficulties limit meat intake and meats are the best dietary sources of B12.
b. Pernicious anemia is common in the elderly.
c. Their diets provide primarily synthetic forms of vitamin B12, which are less absorbable than the protein-bound form found naturally in foods.
d. The elderly have a higher incidence of bacterial overgrowth, which decreases secretion of hydrochloric acid.
e. B12 supplements are expensive and many older adults cannot afford them.
Question 2
Most people in hepatic coma experience all of the following except:
a. elevated blood ammonia levels.
b. increased levels of branched-chain amino acids.
c. an accumulation of potentially toxic compounds in the brain.
d. elevated aromatic amino acid concentrations.
Head rubbing and licking are common social behaviours within a pride
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Metabolism of vitamin B12
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