20. In most proteins this amino acid\'s side chain is found clustered away from
ID: 475725 • Letter: 2
Question
20. In most proteins this amino acid's side chain is found clustered away from the aqueous exterior of the protein as a result of which interaction?
a) Hydrophobic effect
b) Charge-charge (ionic)
c) Dipole-dipole
d) Van der Waals (dispersion)
A protein has a pI of 6.5. If I want to use an anion exchange resin (there is a +ve charge on the resin) to bind the protein, what pH could I perform the separation at?
a) pH 8
b) pH 6.5
c) pH 5
d) The pH doesn't matter
A protein has a pI of 7, what will be the net charge on the protein at pH 5?
a) negative
b) positive
c) no net charge
d) both positive and negative
A protein has a pI of 6.5. If I want to use an anion exchange resin (there is a +ve charge on the resin) to bind the protein, what pH could I perform the separation at?
HoN CH C OH CH CH2 CH3Explanation / Answer
20. Answer:- a
The organic groups which are water repellent are called hydrophobic groups. These try to remain away from water.
Examples of such groups include:- hydrocarbon
On the other hand the groups which are water attractive are called hydrophilic groups.
Example:- -NH2 group
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