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6. What is a protein?
- More than one polypeptide chain
- Something made of amino acids which has a distinct biological function
- A chain of amino acids
7. Is the amino group acidic or basic?
8. Which bonds hold the alpha helix together?
- Hydrogen bonds between the -NH and -CO groups
- Hydrogen bonds between the -NH groups
- Ionic bonds
- Covalent peptide bonds
9. The function of a protein is determined by its _______ structure
- Quaternary
- Primary
- Tertiary
- Secondary
10. When one chain folds over on itself, this produces a __________
- Beta-pleated sheet
- Alpha helix
- Double pleated sheet
11. Is the acid group acidic or basic?
12. Keratin contains many _______ between polypeptide chains adding strength.
- Disulphide bridges
- Glycosidic bonds
- Ionic bonds
13. How is a peptide bond formed?
- Two amino acids are joined by a protein chain
- Two amino acids are joined by a condensation reaction
- Two amino acids are joined by a hydrolysis reaction
14. What is the formula of the amino group?
15. What bond is formed when amino acids join together by condensation?
- A covalent peptide bond
- An ionic peptide bond
- A disulphide bond
- A glycosidic bond
16. Which type of bond holds the beta pleated sheet together?
- Covalent bonds
- Disulphide bonds
- Hydrogen bonds
- Ionic bonds
17. An enzyme is an example of a _______ structure
- Tertiary
- Primary
- Secondary
18. Which three types of bonds help tertiary structures maintain their shape?
- Ionic bonds, hydrogen bonds and disulphide bonds
- Ionic bonds, covalent bonds and hydrogen bonds
- Covalent peptide bonds and disulphide bonds