g. Proteins

yes

What do proteins contain in addition to C, H, and O?

Nitrogen and some might contain sulphur and phosphorus

What same basic monomer makes up all proteins?

Amino acids, making up the polymer polypeptide

How many naturally occurring amino acids are there?

20

What things are attached to the central carbon atom of an amino acid?

• An amino group (basic) - NH₂

• A carboxyl group (acidic) - COOH

• A hydrogen atom

• R group - variable (different in each one)

What happens in the amino group at pH 7?

It gains an hydrogen, becoming positively charged.

What happens in the carboxyl group at pH 7?

It loses an hydrogen, becoming negatively charged.

What is the charge of the amino acid overall at pH 7?

Net zero charge

What is the amino acid called at zero charge?

Zwitterion

What reaction forms a dipeptide?

Condensation reaction

What bond do two amino acids share to make a dipeptide?

Peptide bond forms between the carboxyl group of one amino acid and the amino group of another