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Arginine, leucine, and lysine are all essential amino acids. This means that they are (pick one correct


1 the main intermediates to the urea cycle.

2 only available from a person's diet.

3 not needed for a body to function.

4 produced from other intermediates.

I know essential amino acids can only be obtain from diets but arginine can also be generated from urea cycle, so I'm not sure that's the correct answer

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correct answer is 2 only available from a person's diet. According to the definition of essential amino acids, they must be... View the full answer

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