Valine is an amino acid used to make proteins. it is an essential amino acid meaning the body cannot synthesize it and thus, it
must be obtained from food sources. its side chain is an isopropyl group. what property of valine would you expect from this side
chain?
it is polar.
it is an acid.
it is hydrophobic.
it is hydrophilic
eliminate

The correct option is Option C i.e. its hydrophobic.

Explanation:

The side chain of valine is isopropyl group. It is a hydrocarbon side chain. Isopropane is a hydrophobic compound. So as it joins with the amino acid skeleton as a variable group, it makes the whole amino acid hydrophobic.

Its hydrophobic nature is well evident from the disease of sickle cell anaemia. The replacement of hydrophilic glutamate by hydrophobic valine makes the interaction of haemoglobin by changing other components.

if you know your abc's you should be able to get your answer or just use google