The Only Observable Regular Secondary Structures Are $\alpha$ Helices And $\beta$ Sheets

Q15: Proteins such as hemoglobin are known as

Q16: Which of the following amino acids has

Q17: Which of the following amino acids

Q18: Which of the following structures shows the

Q19: Which of the following amino acids has

Q21: Serine has a _ side chain; valine

Q22: At a pH above its pK_a,

Q23: The formation of a dipeptide from

Q24: The following is an example of

Q25: Which of the 20 standard amino acids