What distinguishes d-amino acids from lamino acids? What biological functions do peptides containing d-amino acids serve?

What chemical groups characterize a hydrophobic amino acid? A hydrophilic amino acid?

What are the structural characteristics common to all amino acids found in naturally occurring proteins?

(a) Draw the structure of the two possible dipeptides that can be formed by combining glycine and asparagine. (b) In each dipeptide, label the N- and C-terminal amino acids. (c) Name each peptide using three-letter symbols.

What are the properties of amino acid end?

How many ways can four different amino acids be arranged in a peptide so that each peptide is unique?

What are the main structural features of an amino acid?

What are peptides?

Polypeptide Handout Amino acids are linked together to form a peptide bond through an aminidation reaction. The-COO group of one amino acid reacts with the -NH3+ of another amino acid. When two are more amino acids are linked together a peptide is formed. Draw the Following Polypeptides: a) Gly-Ser-Met-Lys b) Lys-Pro-Val-His c) Trp-Thr-Leu-lle d) Cys-Met-Phe-Glu e) G-L-A-R-E f) G-L-A-D g) F-H-E-D h) K-E-M-S

Are phosphate groups considered negatively charged and acidic (because the negative charge is due to deprotonation at cellular pH)? Overall, I am confused about the different categorizations for functional groups. My understanding is there are acidic and basic functional groups (for polar, charged amino acids) and there are positive, negative, and neutral functional groups. Is this correct? If so, how do we determine how to categorize functional groups/amino acids in this manner?