I'm assuming you're talking about digestion.
Proteins are broken down by enzyme pepsin in the gastric juice in stomach to form polypeptides.
Proteins are also broken down by enzyme trypsin in the pancreatic juice in the duodenum to form polypeptides.
Polypeptides are then broken down by enzyme erepsin in intestinal juice in small intestines (ileum) to form amino acids.
No, you need protease to break down meat.
Protein
peptidase enzyme
The stomach uses the enzymes to break down foods.
Yes. If enough heat is applied the protein breaks down. This is called denaturing the protein if I recall correctly.
it starts to break down muscle
No ribosomes create proteins and RNA
no only in break down of protein.
Glucose
in the pancreas
salt
The enzyme that digests protein is called pepsin, which is primarily active in the stomach and helps break down protein into smaller peptides.