Proteins (AQA A-Level Chemistry): Quizzes

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Proteins
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What makes the primary structure of proteins highly stable?

Strong covalent peptide bonds

How many amino acids typically form approximately five coils in an α\alpha-helix?

18 amino acids

What range of amino acids does a β\beta-pleated sheet typically span?

3 to 10 amino acids

Which groups form ionic bonds in the tertiary structure of proteins?

−NH3+-NH_3^+ and −COO−-COO^- groups

Which amino acid contains −CH2SH-CH_2SH groups that form disulfide bonds?

Cysteine

What three components make up a nucleotide?

Phosphate, sugar, base

In DNA's double helix, which base pairs with adenine (A)?

Thymine (T)

What does cisplatin bind to in DNA to block replication?

Two adjacent guanine bases

Which agents are used to visualize amino acids in TLC?

Ninhydrin or UV light

How is the RfR_f value calculated in chromatography?

Amino acid distance ÷ Solvent distance

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