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