Amino acids are bound together by a chemical bond known as an amino acid bond to form proteins. a) trueb) false

False

Explanation:

Amino acids are held together by a bond called a peptide bond and not an amino acid bond. A peptide bond is a form of covalent bond that links two amino acids. This is also known as an amide bond. In the making of proteins, peptide bonds link the carboxyl group of one amino acid to the amino group of another.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.