Among the following amino acids, how many is/are basic
Val, Arg, His, Cys, Leu, Lys, Met
Correct answer is '3'. Can you explain this answer?

Question

Among the following amino acids, how many is/are basicVal, Arg, His, Cys, Leu, Lys, MetCorrect answer is '3'. Can you explain this answer?

Answer

Explanation:
There are several types of amino acids, including basic, acidic, neutral, polar, and nonpolar. Basic amino acids are those that have a positive charge at physiological pH, while acidic amino acids have a negative charge. Neutral amino acids have no charge, while polar and nonpolar amino acids differ in their polarity.

Basic Amino Acids:
Basic amino acids are those that have a positively charged side chain at physiological pH. The three basic amino acids are:

1. Lysine (Lys)
2. Arginine (Arg)
3. Histidine (His)

Non-Basic Amino Acids:
The other amino acids in the list are not basic. They include:

1. Cysteine (Cys): This amino acid has a thiol (-SH) group in its side chain, which can form disulfide bonds with another cysteine residue.

2. Leucine (Leu): Leucine is a nonpolar amino acid and is often found in the interior of proteins.

3. Methionine (Met): Methionine is also a nonpolar amino acid and is often found at the beginning of a protein sequence.

Conclusion:
Out of the given amino acids, only three are basic: Lysine, Arginine, and Histidine. The other amino acids are either nonpolar or have other functional groups in their side chains.

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