Question

Match the following statements with the description of what level of structure in a protein?
1. The sequence of amino acids is Asp-Asp-Arg-Asn-Met-Met- etc.
2. The chain of amino acids coils into a helix.
3. Several separate proteins link together to form an active enzyme.
4. The set of linked amino acids folds repeatedly and creates a large globular shape.​

Answer 1

Please understand pictorially from below figure what all these means, (reproduced the image for educational purpose), as i do not have a graphic software (Old computer still running windows xp).

1. The sequence of amino acids is Asp-Asp-Arg-Asn-Met-Met- etc. ----------- Primary structure of protein

showing simply amino acids connectivity is always primary structure level only.

2. The chain of amino acids coils into a helix. -------------- secondary structure

helix, beta sheets, beta turns are referred as secondary structural units

3. Several separate proteins link together to form an active enzyme. -------------- Tertiary structure

two or more secondary structural units combine together and forms a three dimensional structure referred as Tertiary structure of protein. We know enzymes are also proteins and of course they are biological catalysts.

4. The set of linked amino acids folds repeatedly and creates a large globular shape.​ ------ Quaternary structure

This one is formed by all of the above structural motifs, a tertiary structure is considered as a domain, several domains connect together to form a larger globular shape complex is called as Quaternary structure.

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