Which bonds take part in keeping the secondary and tertiary levels of protein structure stable?
- Asecondary: 2 only; tertiary: 1, 2 and 3
- Bsecondary: 2 and 3 only; tertiary: 2 and 3 only
- Csecondary: 1 and 3 only; tertiary: 1 and 3 only
- Dsecondary: 1, 2 and 3; tertiary: 1 only