Question

You may want to reference (Page) Section 10.3 while completing this problem. Determine whether each of the following statements describes the primary, secondary tertiary, or quaternary structure of a protein. Part A Side chains interact to form disulfide bonds Check all that apply. primary protein structure secondary protein structure tertiary protein structure quaternary protein structure Submit Previous Answers Request Answer

Answer 1

A -Disulphide bond is formed between two cysteine residues. Tertiary and quaternary structures are stabilized by bonds formed between the side-chain of amino acids.

In primary structure, there is only a peptide bond and in secondary structure, there is only H-bond formed between the NH and CO of the peptide bond. So option A and B are wrong.

So, the correct answer will be option C and D.

B-

Salt bridge is formed between the acidic amino acid and basic amino acid. Glutamine is an acidic amino acid and lysine and arginine are basic amino acid.

London force Disulfide bond Salt bridae glutamine and arginine Hydrogen bonding threonine and tyrosine leucine and isoleucine lysine and glutamate

London force is formed between hydrophobic amino acids. leucine and isoleucine are hydrophobic amino acid.

A hydrogen bond is formed between polar amino acids. Threonine and tyrosine are charged amino acids.

The disulphide bond is formed between two cysteine residues.

Salt is an ionic compound. It breaks all the polar bonds such as H-bond, salt bridge. H-bond is found in secondary, tertiary and quaternary structure. Salt bridge is found in tertiary and quaternary structure.

So correct options are secondary, tertiary and quaternary.

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