Question

1. Two of the facts which differentiate lipids and carbohydrates from amino acids are that, amino acids can neither be stored nor excreted. True or False?

2. Uridylylation of PII stimulates the formation of glutamine from glutamate. True or False?

Answer 1

(1)

The amino acid concentration is controlled by the liver in the body because the excess amount of amino acids need to be safely excreted. The body does not store amino acids or proteins because they are very toxic to be allowed to get accumulated within the body. Thus, the excess amino acids get converted to urea instead of getting stored.

The amino acids are required for the protein synthesis and other metabolites that contain nitrogen in abundance, thus, amino acids are neither excreted nor stored and the excess amino acid nitrogen gets excreted in the form of   and urea.

Therefore, the statement is true.