6960685
Descripción
Test por Nada Medhat, actualizado hace más de 1 año
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Creado por Nada Medhat
hace más de 8 años
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Pregunta 1
Pregunta
Which of the following statements about amino acids is correct?
Respuesta
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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
Pregunta 2
Pregunta
Which term below best defines the 'quaternary structure' of a protein?
Respuesta
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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
Pregunta 3
Pregunta
Which of the following amino acids is mostly likely to disrupt an alpha helix?
Respuesta
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Proline
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Glycine
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leucine
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none of the above
Pregunta 4
Pregunta
Amino acids are joined by
Respuesta
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hydrogen bond
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peptide bond
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ionic bond
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glycosidic bond
Pregunta 5
Pregunta
A dipeptide has
Respuesta
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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
Pregunta 6
Pregunta
The most common secondary structure is
Respuesta
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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
Pregunta 7
Pregunta
Fibrous protein such as silk fibroin consists of polypeptide chains arranged in
Respuesta
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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
Pregunta 8
Pregunta
Disulphide bonds are formed between
Respuesta
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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
Pregunta 9
Pregunta
Amino acids with hydroxyl groups are
Respuesta
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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
Pregunta 10
Pregunta
Which of the following amino acid has buffering capacity
Respuesta
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Tryptophan
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cysteine
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histidine
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arginine
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