Which of the following amino acids is basic in nature?
A
Valine
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B
Tyrosine
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C
Arginine
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D
Leucine
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Solution
The correct option is C Arginine
In image arginine is shown as above
There are three amino acids that have basic side chains at neutral pH. These are arginine, lysine, and histidine. Their side chains contain nitrogen and resemble ammonia, which is a base.
Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.