Proteins and their Functions

Question 1

Which protein structure has the lowest energy state

Answer 1

Tertiary structure

Question 2

What stabilises the protein structure

Answer 2

Non covalent interactions between side chains

Question 3

What are the functions of proteins

Answer 3

1. Binding
2. Catalysis
3. Switching (Signalling pathways)
4. Structural

Question 4

How are proteins regulated

Answer 4

1. Synthesis - Gene expression only when needed
2. Localisation (where pn needs to be)
3. Modification
4. Degradation

Question 5

How are proteins localised

Answer 5

Each protein has a sorting signal to direct it to correct site

Question 6

How is protein activity controlled

Answer 6

Phosporylation by kinase

Dephosphorylation by phosphatase