Protein - GCSE Chemistry Definition

Proteins are large molecules made from smaller units called amino acids, which are joined in long chains. These chains fold into specific three-dimensional shapes that are important for how the protein works.

Proteins are made from the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. They are essential for life and help with many functions in the body, such as:

• Building and repairing tissues

• Making enzymes and hormones

• Supporting the immune system

In GCSE Chemistry, proteins are studied to understand how their structure and bonding affect their function in living organisms.