Question

What are the main functions of proteins in living things?

Answer 1

Structural and functional

Explanation:

Structural:
proteins in the muscle cells causing contraction
proteins in the cell membrane
proteins in the cytoskeleton of the cell
Functional:
enzymes which hep metabolic reactions to take place
hormones which are chemical signals
antibodies to stick to antigens which helps the immune system to work.
compliment system to help the WBC in the immune system
hemoglobin in RBC to carry oxygen and CO2
myoglobin in the muscle cells to store oxygen