Lec4

Question 1

Acidic amino group

Basic amino group

Answer 1

Acidic COO- negative charged

Basic NH3+ positive charged

Question 2

Polypeptide
Protein
The relationship between these two

Answer 2

Polypeptide is the animo acid sequence

Protein is the polypeptide folding into special confirmation. Functional conformation

Question 3

Weak interactions (4’)

Answer 3

Van der waals

Hydrophobic interaction (tendency for non polar molecules to congregate in water)

Hydrogen bond

Ion bonds (not strong in solution as in crystals)

Question 4

For levels of protein structure

Answer 4

Primary sequence of amino acids
Secondary hydrogen bonds between polypeptide backbone ; coil and fold ; 阿尔法 贝塔
Tertiary. Weak interactions between R group;
Quaternary. Not all have this form . 2or more subunits

Question 5

Desaturation

Renaturation

Answer 5

Denaturation. Unfolding the protein structure ; PH temp toxic environment.

Question 6

Functions of proteins

Answer 6

Support and structure
Protection and Against disease
Recognize cell
Carry information
Catalyze
Movement 
Transport
Energy
Receive signals