Aliphatic Amino Acids Classification
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Questions and Answers

What is the role of non-essential amino acids in the human body?

  • They can be synthesized by the body to meet biological needs (correct)
  • They are not digestible and hence not absorbed by the body
  • They are always absent in a healthy diet
  • They are only required for growth and development in children
  • How do hydrophilic amino acids interact with water?

  • They repel water due to their non-polar nature
  • They have no charge and do not interact with water
  • They have partial positive and negative charges, attracting water (correct)
  • They are broken down into smaller molecules in the presence of water
  • What is the characteristic of hydrophobic amino acids?

  • They are polar and attracted to water
  • They have partial charges and interact with water
  • They are only found in plant-based proteins
  • They are nonpolar and repel water (correct)
  • What happens to some amino acids after protein synthesis?

    <p>They are modified into derived amino acids</p> Signup and view all the answers

    How many amino acids can the human body synthesize?

    <p>10 amino acids</p> Signup and view all the answers

    What is the classification of amino acids based on their R-groups?

    <p>Hydrophobic and hydrophilic</p> Signup and view all the answers

    What is the main product of the ninhydrin test, which is responsible for the blue color?

    <p>A reduced ninhydrin compound</p> Signup and view all the answers

    Which of the following amino acids undergoes alpha decarboxylation to form an amine, which is a component of neurotransmitters?

    <p>Glutamic acid</p> Signup and view all the answers

    What is the role of the amide group of glutamine in nucleic acid synthesis?

    <p>It serves as a source of nitrogen</p> Signup and view all the answers

    Which of the following reactions is responsible for the formation of NH3 in the ninhydrin test?

    <p>Oxidative decarboxylation</p> Signup and view all the answers

    What is the role of the side-chain groups in proteins?

    <p>They are free to ionize</p> Signup and view all the answers

    Which of the following is NOT a component of protein structure?

    <p>Tyramine</p> Signup and view all the answers

    Which of the following amino acids contains a phenyl ring?

    <p>Phenylalanine</p> Signup and view all the answers

    Which category of amino acids includes Aspartic acid and Glutamic acid?

    <p>Aliphatic acidic amino acids</p> Signup and view all the answers

    What is unique about Cystine among the aliphatic neutral amino acids?

    <p>It is composed of two cysteine residues linked by a disulphide bond</p> Signup and view all the answers

    Which of the following amino acids is both aromatic and basic?

    <p>Histidine</p> Signup and view all the answers

    What is the primary goal when comparing two sequences?

    <p>To align the two sequences to maximize the number of identical residues while minimizing the number of sequence insertions or deletions</p> Signup and view all the answers

    What is the effect of a single amino acid change in the linear sequence of a protein?

    <p>It has a profound biological effect on the function</p> Signup and view all the answers

    Which of the following amino acids is classified as an imino acid?

    <p>Proline</p> Signup and view all the answers

    Which of the following amino acids is not an essential amino acid?

    <p>Glycine</p> Signup and view all the answers

    What is unique about the primary structure of insulin?

    <p>It has two polypeptide chains held together by disulfide bonds</p> Signup and view all the answers

    What is the difference between pig insulin and human insulin?

    <p>The C-terminal amino acid in the B chain</p> Signup and view all the answers

    Why does de-alaninated pig insulin not produce antibodies in diabetic patients?

    <p>Because it has a similar primary structure to human insulin</p> Signup and view all the answers

    What is the effect of sickle cell Hb on RBCs?

    <p>They assume a sickled form</p> Signup and view all the answers

    What is the result of hydrolytic decomposition of proteins?

    <p>Proteoses</p> Signup and view all the answers

    What is the effect of denaturating agents on proteins?

    <p>Irreversible denaturation</p> Signup and view all the answers

    What is the consequence of breaking cross links in proteins?

    <p>Rearrangement of secondary and tertiary structures</p> Signup and view all the answers

    What is the term for proteins in their natural state?

    <p>Native proteins</p> Signup and view all the answers

    What is the consequence of heat treatment on albumin?

    <p>Denaturation and coagulation</p> Signup and view all the answers

    What is the effect of denaturation on protein structure?

    <p>Rearrangement of secondary and tertiary structures</p> Signup and view all the answers

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