A $- \mathrm { OH }$ B
C $- \mathrm { NH } _ { 2 }$

question 12

Multiple Choice

A. $- \mathrm { OH }$
B.
C. $- \mathrm { NH } _ { 2 }$
D. $- \mathrm { SH }$
- Which of the functional groups shown helps stabilise proteins by forming covalent cross-links within or between protein molecules?

• A) A
• B) B
• C) C
• D) D