6960685
Descrição
Quiz por Nada Medhat, atualizado more than 1 year ago
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Criado por Nada Medhat
mais de 7 anos atrás
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Questão 1
Questão
Which of the following statements about amino acids is correct?
Responda
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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
Questão 2
Questão
Which term below best defines the 'quaternary structure' of a protein?
Responda
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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
Questão 3
Questão
Which of the following amino acids is mostly likely to disrupt an alpha helix?
Responda
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Proline
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Glycine
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leucine
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none of the above
Questão 4
Questão
Amino acids are joined by
Responda
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hydrogen bond
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peptide bond
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ionic bond
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glycosidic bond
Questão 5
Questão
A dipeptide has
Responda
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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
Questão 6
Questão
The most common secondary structure is
Responda
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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
Questão 7
Questão
Fibrous protein such as silk fibroin consists of polypeptide chains arranged in
Responda
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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
Questão 8
Questão
Disulphide bonds are formed between
Responda
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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
Questão 9
Questão
Amino acids with hydroxyl groups are
Responda
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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
Questão 10
Questão
Which of the following amino acid has buffering capacity
Responda
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Tryptophan
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cysteine
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histidine
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arginine
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