What is the role of protein in a cell?

Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs. These proteins provide structure and support for cells. On a larger scale, they also allow the body to move.

Explanation:

three major roles of proteins are:

hormones. Many hormones are protein in nature; hormones control growth and metabolic activities of the body.

catalytic activities. Enzymes are globular protein.  

Transport of oxygen.

Blood Clotting.

Immunity.

Muscles contractility.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

measured, submerged.