Unit 2

Question 1

protein primary sequence (2)

Answer 1

• sequence of amino acids

- stabilized by covalent bonds between backbone atoms

Question 2

secondary protein structure (2)

Answer 2

• alpha helices and beta sheets

- stabilized by non-covalent bonds between backbone atoms

Question 3

tertiary protein structure (2)

Answer 3

• final folded protein structure
• stabilized by covalent bonds between R groups and non covalent bonds between backbone atoms, backbone and R groups, and between R groups

Question 4

quaternary protein structure (2)

Answer 4

• complex of 2 or more tertiary proteins
• stabilized by covalent bonds between R groups and non covalent bonds between backbone atoms, backbone and R groups, and between R groups

Question 5

disulfide bond

Answer 5

• S-S bond
• covalent bond between 2 thiol groups
• not formed in cytosol because of reducing environment