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protein

Nada Medhat 10 questions

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Questions in this quiz (10)

  1. 1Which of the following statements about amino acids is correct?
    1. AAmino acids are classified according to the structures and properties of their side chains
    2. BAmino acids are uncharged at neutral pH
    3. CAmino acids in proteins are mainly in the D-configuration
    4. DTwenty four amino acids are commonly used in protein synthesis
  2. 2Which term below best defines the 'quaternary structure' of a protein?
    1. AThe arrangement of two or more polypeptide subunits into a single functional complex
    2. BThe folding of the polypeptide backbone in three-dimensional space.
    3. CThe interaction of amino acid side chains
    4. DThe sequence of amino acids in a polypeptide chain
  3. 3Which of the following amino acids is mostly likely to disrupt an alpha helix?
    1. AProline
    2. BGlycine
    3. Cleucine
    4. Dnone of the above
  4. 4Amino acids are joined by
    1. Ahydrogen bond
    2. Bpeptide bond
    3. Cionic bond
    4. Dglycosidic bond
  5. 5A dipeptide has
    1. A2 amino acids and 1 peptide bond
    2. B2 amino acids and 2 peptide bonds
    3. C2 amino acids and 3 peptide bonds
    4. D2 amino acids and 4
  6. 6The most common secondary structure is
    1. Aα-helix
    2. Bβ-pleated sheet
    3. Cβ-pleated sheet paralle
    4. Dβ-pleated sheet non parallel
  7. 7 Fibrous protein such as silk fibroin consists of polypeptide chains arranged in
    1. Aα-helix
    2. Bβ-pleated sheet
    3. Cβ-helix
    4. Dnone of these
  8. 8 Disulphide bonds are formed between
    1. Acystine residues that are close together
    2. Bproline residues that are close together
    3. Ccysteine residues that are close together
    4. Dhistidine residues that are close together
  9. 9 Amino acids with hydroxyl groups are
    1. Aserine and alanine
    2. BAlanine and valine
    3. Cserine and threonine
    4. DValine and isoleucine
  10. 10Which of the following amino acid has buffering capacity
    1. ATryptophan
    2. Bcysteine
    3. Chistidine
    4. Darginine

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