Within a naturally-occurring polypeptide, under neutral pH conditions (pH = 7.0), which of the following amino acids always has a positively charged amine group? (Choose one answer)  the first amino acid in the primary structure histidine lysine arginine the last amino acid in the primary structure

You will now build a 15 amino acid peptide using another paper or wire backbone as you did above.  You will pick 15 amino acids, matching the criteria below, and put them onto your backbone about 3 inches apart.  This will be the primary structure of your novel protein.  Select  15 amino acids that meet the following criteria 6 hydrophobic R groups 2 acidic R groups 2 basic R groups 2 cysteine R groups 3 hydrophilic R groups  Place the R groups in any order you choose on your paper or wire backbone as you did above. Start at the N-terminus and place each R group about 3 inches apart until all 15 are attached to the mini toolbar. You have just built the primary structure of your protein.     Question 1:  Record the sequence of amino acids in your protein, starting with the N-terminus.  The N-terminus is the end of the polypeptide that has a free nitrogen group.  The C-terminus, or carboxyl end, will have a free carboxyl group. You can use the three letter amino acid abbreviation to…

In the peptide shown below, a covalent bond that could rotate to form secondary structure is correctly identified / labeled by letter: A B OH still fot D OB OC O O O B D F C OA HN E NH OH "NH₂ - F

Consider the protein below: HO HỘ NH CH-OH CH Identify/Name the noncovalent interaction between groups in the following locations: Σ