Amino acid at the isoelectric point (pI) is a(an)
A、nonpolar molecule非极性分子
B、anionic阴离子
C、cationic阳离子
D、zwitterion兼性离子
A、nonpolar molecule非极性分子
B、anionic阴离子
C、cationic阳离子
D、zwitterion兼性离子
A、nonpolar molecule
B、anionic
C、cationic
D、zwitterion
A. low and rocky with scattered small pine trees
B. a low lying wetland
C. a high sandy bluff
D. a flat wooded plai
A、A compound formed of two or more amino acids linked by peptide bonds.
B、The amino acids that make up the peptides are residues.
C、The peptide chain has amino terminus and carboxyl terminus.
D、Oligopeptides less than 10 amino acids don’t have function.
A、disulfide bond
B、hydrophobic effect
C、peptide bond
D、hydrogen bond
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