Protein Metabolism and Amino Acid Turnover Quiz

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36 Questions

What is the fate of excess and unwanted proteins in the body?

They are degraded to amino acids

Which amino acid is the major NH2-group donor for the synthesis of non-essential amino acids?

Glutamate

What is the first step in the catabolism of amino acids?

Removal of the NH2 group

Which vitamin is needed for the transamination of amino acids?

Vitamin B6 in the form of pyridoxal phosphate

Which enzyme catalyzes the reaction of transferring NH2 from majority of the amino acids to α-ketoglutarate?

Glutamate dehydrogenase

What activates glutamate dehydrogenase, the enzyme involved in the oxidative deamination of glutamate?

ADP/GDP

Which enzyme is the rate-limiting enzyme in the urea cycle?

Carbamoyl phohphate synthetase-I

Where does the conversion of ammonia into urea take place?

Mitochondria

Which amino acids are classified as both glucogenic and ketogenic?

Tyrosine, isoleucine, phenylalanine, and tryptophan

Which intermediates can the carbon skeleton of amino acids be converted into?

Pyruvate and acetyl CoA

What are the genetic defects in amino acid metabolism caused by?

Mutations in the genes of the enzymes involved

Which condition results from mutations in the genes of the enzymes involved in amino acid metabolism?

Mental retardation and developmental disabilities

Which of the following amino acids are only ketogenic and not glucogenic?

Leucine and lysine

What is required in some places for the detection of genetic defects in amino acid metabolism in newborns?

Neonatal screening

Which of the following is an important genetic defect in amino acid metabolism?

PKU

What is the major transaminase involved in transamination of amino acids?

Alanine aminotransferase (ALT)

Which amino acid participates in transamination along with threonine?

Lysine

Which enzyme catalyzes the oxidative deamination of glutamate?

Glutamate dehydrogenase

Which amino acid is only ketogenic and not glucogenic?

Leucine

Which of the following is a precursor required for the urea cycle?

NH3

Which enzyme is the rate-limiting enzyme in the urea cycle?

Carbamoyl phosphate synthetase-I

Which of the following amino acids can be converted into acetoacetate or acetyl CoA?

Tyrosine

Which amino acid is classified as both glucogenic and ketogenic?

Phenylalanine

Which condition results from mutations in the genes of the enzymes involved in amino acid metabolism?

PKU

What activates glutamate dehydrogenase, the enzyme involved in the oxidative deamination of glutamate?

ADP/GDP

What is the fate of excess and unwanted proteins in the body?

Converted into urea

Which of the following is a common result of metabolic defects in amino acid metabolism?

Mental retardation

Which vitamin is needed for the transamination of amino acids?

Vitamin B6

What is the first step in the catabolism of amino acids?

Removal of the NH2 group

Which enzyme catalyzes the transfer of NH2 from amino acids to α-ketoglutarate?

Aminotransferases

What is the major NH2-group donor for the synthesis of non-essential amino acids?

Glutamate

Which vitamin is needed in the form of pyridoxal phosphate for the transamination of amino acids?

Vitamin B6

What is the major fate of excess and unwanted proteins in the body?

Degraded to amino acids

Which vitamin is required for transamination of amino acids?

Vitamin B6

What is the first step in the catabolism of amino acids?

Removal of the NH2 group

What is the major NH2-group donor for the synthesis of non-essential amino acids?

Glutamate

Test your knowledge of protein metabolism and amino acid turnover with this quiz. Explore the synthesis of non-essential amino acids, the body's amino acid pool, and the constant turnover of body proteins. See how much you know about the intricate processes of amino acid metabolism.

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