How many types of R groups are there in amino acids?

Related questions

1. Why do amino acids dissolve in water?
2. Are all amino acids Zwitterions?
3. How does the sequence of amino acids affect the structure and function of proteins?
4. What is Zwitterion give example?
5. What is the role of amino acids in protein synthesis?
6. How is Zwitterion formed?
7. What is the purpose of the R groups of the amino acids?
8. Do amino acids occur naturally?
9. What are the 4 types of amino acids?
10. Why are proteins called amphoteric?

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18. #amino