If the sole source of protein is gelatin, growth is inhibited because:
A. Gelatin has no tryptophan and is low in methionine and lysine
B. gelatin has no methionine and is low in tryptophan
C. gelatin has no lysine or methionine and is low in tryptophan
D. gelatin has no arginine
Ans: A. Gelatin has no tryptophan and is low in methionine and lysine
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