Science differs from other disciplines because it relies heavily on facts and principles. Science has this type of policy were if it cannot be proven then it cannot be true and as such scientist do many investigations and test to prove hypotheses true or false.
The "R" group of an amino acid makes it unique from other amino acids
B) bacteria are living organisms; viruses are not.
Answer:
Glycine is a highly conserved amino acid residue in the evolution of proteins. Why? Glycine has the smallest side chain of any amino acid. Its size often is critical in allowing polypeptide chains to make tight turns or to approach one another closely.
Explanation: