Answer :

last one The side groups are what make each amino acid different from the others. Of the 20 side groups used to make proteins, there are two main groups: polar and non-polar. These names refer to the way the side groups, sometimes called "R" groups, interact with the environment.

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The amino-acids are different from each other due to their SIDE CHAINS.

  • The side chain confers to amino-acids their unique physical and chemical properties, thereby determining their structure and function.

  • The side chain is generally called the R group and abbreviated with the letter R.

  • For example serine and threonine have polar side chains and therefore they are soluble in water.

In conclusion, amino-acids are different from each other due to their SIDE CHAINS.

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