6960685
Description
Quiz by Nada Medhat, updated more than 1 year ago
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Created by Nada Medhat
over 7 years ago
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Question 1
Question
Which of the following statements about amino acids is correct?
Answer
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Amino acids are classified according to the structures and properties of their side chains
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Amino acids are uncharged at neutral pH
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Amino acids in proteins are mainly in the D-configuration
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Twenty four amino acids are commonly used in protein synthesis
Question 2
Question
Which term below best defines the 'quaternary structure' of a protein?
Answer
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The arrangement of two or more polypeptide subunits into a single functional complex
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The folding of the polypeptide backbone in three-dimensional space.
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The interaction of amino acid side chains
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The sequence of amino acids in a polypeptide chain
Question 3
Question
Which of the following amino acids is mostly likely to disrupt an alpha helix?
Answer
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Proline
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Glycine
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leucine
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none of the above
Question 4
Question
Amino acids are joined by
Answer
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hydrogen bond
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peptide bond
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ionic bond
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glycosidic bond
Question 5
Question
A dipeptide has
Answer
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2 amino acids and 1 peptide bond
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2 amino acids and 2 peptide bonds
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2 amino acids and 3 peptide bonds
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2 amino acids and 4
Question 6
Question
The most common secondary structure is
Answer
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α-helix
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β-pleated sheet
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β-pleated sheet paralle
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β-pleated sheet non parallel
Question 7
Question
Fibrous protein such as silk fibroin consists of polypeptide chains arranged in
Answer
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α-helix
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β-pleated sheet
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β-helix
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none of these
Question 8
Question
Disulphide bonds are formed between
Answer
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cystine residues that are close together
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proline residues that are close together
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cysteine residues that are close together
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histidine residues that are close together
Question 9
Question
Amino acids with hydroxyl groups are
Answer
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serine and alanine
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Alanine and valine
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serine and threonine
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Valine and isoleucine
Question 10
Question
Which of the following amino acid has buffering capacity
Answer
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Tryptophan
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cysteine
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histidine
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arginine
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