A group of rats being fed gelatin as the sole protein source are not growing well. What is the likely reason?
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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