Name the two most common atoms hydrogen bonds within biological systems that give hydrogen a partial positive charge. 2. Are the atoms named in the question above in the backbone of the protein or are they found in R groups?  Which R groups? 3. Besides hydrogen, what other atom is involved in the hydrogen bonds in an alpha helix or beta sheet? In other words, hydrogen is interacting with what other atoms when it makes a hydrogen bond? 4. Write out, in order, the full names of the seven amino acids circled in the picture.

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