What is the structure of a protein?

Proteins are a class of molecules made up of small sub-units called amino acids. Every type of protein has a unique structure. The primary structure of a protein is the type and number of amino acids in the protein and the order in which they are arranged, similar to different coloured beads on a piece of string. This string of amino acids is then folded into the proteins secondary structure. Depending on the protein, its secondary structure can either be classified as an alpha-helix (looks like a spiral) or a beta-pleated sheet (looks like a fan). The secondary structure is then folded again into a globular shape which is known as the protein's tertiary structure. Some proteins stop here however some proteins go further and develop a quaternary structure. This involves multiple globular proteins joining together to form a bigger protein.

Answered by Joanna B. Biology tutor

1704 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Describe how an action potential is generated.


How does deforestation lead to reduced soil fertility?


Describe the first three levels of protein structure and the interactions which stabilise them.


How do the different organelles in a eukaryotic cell work together to produce a hormone such as insulin?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences