Proteins

Question 1

proteins are made of

Answer 1

amino acids, polypeptides

Question 2

peptide bond

Answer 2

covalent bond between the carboxyl group of one amino acid and the amino group of another amino acid

Question 3

protein describe primary structure & bonds

Answer 3

• The amino acid sequence encoded by DNA
• Order is critical, determines shape
• Hydrogen bonds

Question 4

protein describe secondary structure & bonds

Answer 4

• Alpha helixes and beta sheets (sometimes beta pleated sheets) along the amino acid backbone
• hydrogen bonds across amino and carboxyl groups

Question 5

protein describe tertiary structure & bonds

Answer 5

• other “loops, turns, curves” of polypeptide
• hydrogen bonds, hydrophobic interactions, disulfide bridge (two amino acids with sulfur form a covalent bond), ionic bonds, van der waals interactions

Question 6

protein describe quarternary structure & bonds

Answer 6

• Multiple polypeptides

- hydrogen bonds, disulfide bonds