The three-dimensional shape of a protein is determined by the:
a. ratio of nonessential to essential amino acids present in the polypeptide chain.
b. sequence of amino acids in the polypeptide chain.
c. carbon to nitrogen ratio in the polypeptide chain.
d. the number of peptide bonds present in the polypeptide chain.
Answer: b. sequence of amino acids in the polypeptide chain.
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Which of the following compounds does NOT contain nitrogen?
a. Urea b. Enzymes c. Ammonia d. Cholesterol
Heart disease is a progressive disease that may begin in childhood
a. True b. False Indicate whether the statement is true or false
Metabolic rate and energy expenditure begin to decline in early adulthood at a rate of about _____ per decade for women and _____ per decade for men
a. 2.0%; 2.9% b. 5.0%; 5.9% c. 8.0%; 8.0% d. 5.9%; 5.0% e. 2.9%; 2.0%
The proteins ________ oxidize ferrous iron to ferric iron to allow iron to be transported to body cells.
A. hemosiderin and ferritin B. hephaestin and ceruloplasmin C. ferritin and albumin D. heme and non-heme