Protein Metabolism and Amino Acid Turnover Quiz

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

They are degraded to amino acids (correct)

They are excreted as urea

They are stored for future use

They are converted to glucose

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

Alanine

Glycine

Glutamate (correct)

Leucine

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

Formation of ketone bodies

Conversion to glucose

Synthesis of body proteins

Removal of the NH2 group (correct)

Which vitamin is needed for the transamination of amino acids?

Vitamin B6 in the form of pyridoxal phosphate Signup and view all the answers

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

Glutamate dehydrogenase Signup and view all the answers

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

ADP/GDP Signup and view all the answers

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

Carbamoyl phohphate synthetase-I Signup and view all the answers

Where does the conversion of ammonia into urea take place?

Mitochondria Signup and view all the answers

Which amino acids are classified as both glucogenic and ketogenic?

Tyrosine, isoleucine, phenylalanine, and tryptophan Signup and view all the answers

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

Pyruvate and acetyl CoA Signup and view all the answers

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

Mutations in the genes of the enzymes involved Signup and view all the answers

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

Mental retardation and developmental disabilities Signup and view all the answers

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

Leucine and lysine Signup and view all the answers

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

Neonatal screening Signup and view all the answers

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

PKU Signup and view all the answers

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

Alanine aminotransferase (ALT) Signup and view all the answers

Which amino acid participates in transamination along with threonine?

Lysine Signup and view all the answers

Which enzyme catalyzes the oxidative deamination of glutamate?

Glutamate dehydrogenase Signup and view all the answers

Which amino acid is only ketogenic and not glucogenic?

Leucine Signup and view all the answers

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

NH3 Signup and view all the answers

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

Carbamoyl phosphate synthetase-I Signup and view all the answers

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

Tyrosine Signup and view all the answers

Which amino acid is classified as both glucogenic and ketogenic?

Phenylalanine Signup and view all the answers

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

PKU Signup and view all the answers

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

ADP/GDP Signup and view all the answers

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

Converted into urea Signup and view all the answers

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

Mental retardation Signup and view all the answers

Which vitamin is needed for the transamination of amino acids?

Vitamin B6 Signup and view all the answers

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

Removal of the NH2 group Signup and view all the answers

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

Aminotransferases Signup and view all the answers

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

Glutamate Signup and view all the answers

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

Vitamin B6 Signup and view all the answers

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

Degraded to amino acids Signup and view all the answers

Which vitamin is required for transamination of amino acids?

Vitamin B6 Signup and view all the answers

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

Removal of the NH2 group Signup and view all the answers

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

Glutamate Signup and view all the answers

Protein Metabolism and Amino Acid Turnover Quiz

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Questions and Answers

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

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

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

Which vitamin is needed for the transamination of amino acids?

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

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

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

Where does the conversion of ammonia into urea take place?

Which amino acids are classified as both glucogenic and ketogenic?

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

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

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

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

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

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

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

Which amino acid participates in transamination along with threonine?

Which enzyme catalyzes the oxidative deamination of glutamate?

Which amino acid is only ketogenic and not glucogenic?

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

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

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

Which amino acid is classified as both glucogenic and ketogenic?

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

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

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

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

Which vitamin is needed for the transamination of amino acids?

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

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

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

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

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

Which vitamin is required for transamination of amino acids?

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

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

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