Y1S2 002 I Biochem Structure and Composition of Biopolymers
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Questions and Answers

What is the monomer unit of nucleic acids?

  • Polypeptide chain
  • Nucleotides (correct)
  • Amino acids
  • Biopolymers

What determines the characteristics of proteins?

  • The presence of carbohydrates in the protein
  • The number of amino acids present
  • The spatial relationship of one amino acid to another only
  • The kinds of amino acids present and their order in the polypeptide chain (correct)

What is the type of amino acid that is positively charged?

  • Diaminomonocarboxylic acid (correct)
  • Polar amino acid
  • Monoaminodicarboxylic acid
  • Non-polar amino acid

What is the unique characteristic of glycine?

<p>It has no optical activity (D)</p> Signup and view all the answers

Why are D-amino acids not present in proteins?

<p>They are not present in proteins, but are found in polypeptides and antibiotics (B)</p> Signup and view all the answers

What is the carbon atom that bears the C=O and NH2 groups?

<p>α-Carbon (A)</p> Signup and view all the answers

What is the purpose of transporting NH4+ in the form of glutamine?

<p>To prevent its interference with the body system (D)</p> Signup and view all the answers

What is the byproduct of the reaction catalyzed by glutaminase in the liver?

<p>Glutamate and NH4+ (C)</p> Signup and view all the answers

What is the source of the C atom in the urea cycle?

<p>CO2 (D)</p> Signup and view all the answers

What is the function of ornithine in the urea cycle?

<p>To transport nitrogen and carbon atoms (D)</p> Signup and view all the answers

Why is the urea cycle important in the liver?

<p>To detoxify ammonia (C)</p> Signup and view all the answers

What is the source of one of the nitrogen atoms in the urea cycle?

<p>NH4+ (A)</p> Signup and view all the answers

What is the byproduct of the reaction catalyzed by CARBAMOYL PHOSPHATE SYNTHETASE I?

<p>CARBAMOYL PHOSPHATE (D)</p> Signup and view all the answers

What is the role of N-ACETYL GLUTAMATE in the synthesis of Carbamoyl Phosphate?

<p>It is required for the enzyme's activity (C)</p> Signup and view all the answers

What is the net ATP cost of the reaction catalyzed by CARBAMOYL PHOSPHATE SYNTHETASE I?

<p>2 ATP (C)</p> Signup and view all the answers

Where does the synthesis of Carbamoyl Phosphate occur?

<p>Mitochondrial matrix (A)</p> Signup and view all the answers

What is the purpose of the Urea cycle?

<p>To detoxify ammonia (B)</p> Signup and view all the answers

What is the nature of Urea?

<p>A neutral electrolyte compound (A)</p> Signup and view all the answers

Where does the formation of citrulline occur?

<p>In the mitochondria (A)</p> Signup and view all the answers

What is the enzyme that catalyzes the formation of citrulline?

<p>Ornithine carbamoyltransferase (D)</p> Signup and view all the answers

What is the source of the second amino group required for urea synthesis?

<p>Aspartate (D)</p> Signup and view all the answers

What is the energy source for the formation of arginino succinate?

<p>ATP (D)</p> Signup and view all the answers

What is the product of the condensation reaction of aspartate and citrulline?

<p>Arginino succinate (A)</p> Signup and view all the answers

What is the enzyme that synthesizes arginino succinate?

<p>Arginino succinate synthetase (A)</p> Signup and view all the answers

What is the biochemical defect that leads to maple syrup disease?

<p>Absence of α-keto acid decarboxylase enzyme (B)</p> Signup and view all the answers

Which amino acids are converted to oxAA?

<p>Aspartate, asparagine, and glutamine (B)</p> Signup and view all the answers

What is the characteristic feature of the urine in patients with maple syrup disease?

<p>Maple syrup or burnt sugar smell of the urine (B)</p> Signup and view all the answers

What is the consequence of the absence of α-keto acid decarboxylase enzyme?

<p>Elevated levels of branched-chain amino acids and their corresponding α-keto acids (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of branched-chain amino acids?

<p>They are negatively charged (B)</p> Signup and view all the answers

What is the consequence of the accumulation of branched-chain amino acids in the urine?

<p>Branched-chain ketonuria (B)</p> Signup and view all the answers

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