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The substituents R(1) and R(2) for nine ...

The substituents `R_(1)` and `R_(2)` for nine peptides are listed are listed in the table given below. How many of these peptides are positively charged at `pH = 7.0` ?
`H_(3)overset(o+)(N)-underset(H)underset(|)(C )H-CO-NH-underset(R_(1))underset(|)(C )H-CO-NH-underset(R_(2))underset(|)(C )H-CO-NH-underset(H)underset(|)(C )H-CO overset(Θ)(O)`

Text Solution

Verified by Experts

The peptides which are of basic nature are positiviely charged. In the peptides that are listed, those carrying groups like `-CH_(2)OH, -overset(O)overset(||)(C )-NH_(2)` and `-CH_(3)` are of neutral nature. Thus, four are positively charged since these are of basic nature.
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