Amino acids have a basic amino group and acidic carboxil group. On the basis of number of amino or carboxil group they can be acidic, basic or neutral in nature. Link to the online chapter test : Biomolecules:- https://onlinenbt.com/biomolecules_test_1.html     https://onlinenbt.com/biomolecules_test_2.html ____________________________________________________________________ The study notes are available on Amazon India. The related     affiliate links are provided below Genetics and Evolution – https://amzn.to/2Sh27jW Cell: Structure and Functions – https://amzn.to/2GPagcm Reproduction – https://amzn.to/2wu43eS Human Physiology –  http://amzn.to/2DA46ea Plant Physiology – http://amzn.to/2EZR5HS Biotechnology – http://amzn.to/2EZyqf9 Free Delivery (On Selected Pin codes) !!!, Cash on Delivery Available!!! ____________________________________________________________________ Amazon Affiliate links to the products which we use for our videos: Canon 80D: https://amzn.to/2KZKfr4 Canon 24mm STM Lense: https://amzn.to/37Ll8lU Canon 55-250mm Lense: https://amzn.to/2QVWVmA Wireless Microphone: https://amzn.to/2QUCuXp On-Camera Microphone: https://amzn.to/34pSN25 Tripod: https://amzn.to/2Orlczr ____________________________________________________________________ Follow us on Instagram to get a more behind the scenes experience https://www.instagram.com/neelabakore/ Follow us on Twitter to get your doubts/questions solved and be updated on NOTES!!! https://twitter.com/neelabakore