Transaminases: Enzymes and Features

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Which enzyme is responsible for cleaving one amino acid at a time from amino terminals of peptides?

Dipeptidase

Pepsin

Aminopeptidase (correct)

Tripeptidase

Where does the absorption of amino acids primarily occur?

Stomach

Pancreas

Upper small intestine (correct)

Large intestine

Which enzyme catalyzes the reversible transfer of an amino group between an 'α' amino acid and an 'α' keto acid?

Phosphatase

Kinase

Transaminase (correct)

Dehydrogenase

Which phase of protein digestion involves the conversion of casein into calcium paracaseinate?

Gastric phase Signup and view all the answers

Except for lysine, threonine, proline, and hydroxyproline, which amino acids undergo transamination reactions?

Alanine, leucine, isoleucine, valine Signup and view all the answers

What is the energy-dependent process by which amino acids are absorbed along with sodium?

Active transport Signup and view all the answers

What is the main function of transamination reactions in the body?

Synthesis of essential amino acids Signup and view all the answers

What is the total pool of amino acids available in the blood at any given time called?

Amino acid pool Signup and view all the answers

In which conditions are transaminase levels typically increased, making them useful in diagnosis?

Hepatitis Signup and view all the answers

Which enzyme converts dipeptides to amino acids?

Dipeptidase Signup and view all the answers

What is the fate of ammonia generated from deamination reactions in the body?

Converted to urea for excretion Signup and view all the answers

How is the toxic ammonia transported in the body to prevent its harmful effects?

As glutamine from muscle to liver Signup and view all the answers

Which of the following amino acids can be used to synthesize glycine?

Serine Signup and view all the answers

What are the substrates for Glycine synthase in the biosynthesis of glycine?

CO2 and NH3 Signup and view all the answers

In the degradation of glycine, which molecule is not involved as a precursor for glycine synthesis?

Aspartate Signup and view all the answers

Which amino acid is a nitrogen atom donor in the urea cycle?

Arginine Signup and view all the answers

Which molecule is a positive allosteric effector of carbamoyl phosphate synthetase1 (CPS-1)?

N-acetyl glutamate Signup and view all the answers

Which treatment option is used to remove ammonia from blood in urea cycle defects?

Hemodialysis Signup and view all the answers