Exam 17: Amino Acid Metabolism

In the urea cycle the nitrogen atoms originate from ________.

Phenylalanine hydroxylase requires molecular ________ and tetrahydrobiopterin.

Which disease is caused by a defect in ornithine transaminase activity?

Which statement is false about protein turnover?

All 20 common amino acids are metabolized through the citric acid cycle by first being converted to either pyruvate or acetyl CoA.

ATP is required to degrade many proteins because it is required to

In animals glutamate synthase is essential for the production of glutamate.

Nitric oxide is formed from arginine.It is a messenger molecule with several functions that include all below except

Which amino acids are purely ketogenic?

Only growing and reproducing cells require a continuous supply of amino acids for the synthesis of new protein molecules.

Which type of organisms can eliminate excess nitrogen by the direct excretion of ammonia?

Acids are often produced in the body as metabolic end products.These acids are neutralized in the blood,which depletes the blood's ________ supply.

Which is not part of the synthesis reactions for histidine?

Nitrogen fixation may occur via all of the following bacteria,except

At the subcellular level where does the urea cycle occur?

Oxaloacetate is the amino-group acceptor in the synthesis of aspartate.

Glycine is a precursor for all of the following except

Which statement(s)applies(apply)to urea?

In mammals,ureagenesis occurs almost exclusively in the ________.

________ is hydrolytically cleaved to directly yield urea in the urea cycle.