Answer:
the answer is b oxygen attract electrons more strongly than hydrogen does
I believe it is muscle cells, I'm sorry if this is incorrect.
Answer:
Section 3.2Primary Structure: Amino Acids Are Linked by Peptide Bonds to Form Polypeptide Chains. Proteins are linear polymers formed by linking the α-carboxyl group of one amino acid to the α-amino group of another amino acid with a peptide bond (also called an amide bond).