LT   EN   RU  
Thursday 28 October 2021 Straipsniai.lt - Independent and informative portal
Home
Phorum
Contacts
Login
Register   Login
News subscribe
Subscribe   Unsubscribe
Partners
www.slaptai.lt www.gamezone.lt
www.penki.lt www.hakeriai.lt
   
   
Advertising
Statistic
Visits since 2002 09 12 - 68275693
Pages in Straipsniai.lt: 40735
  
  Science > Chemistry
Amino Acids
Usage rating

Amino acids contain both a carboxyl group (COOH) and an amino group (NH2). The general formula for an amino acid is given below. Although the neutrally-charged structure is commonly written, it is inaccurate because the acidic COOH and basic NH2 groups react with one another to form an internal salt called a zwitterion. The zwitterion has no net charge; there is one positive (COO-) and one negative (NH3+) charge. There are 20 amino acids derived from proteins. While there are several methods of categorizing them, one of the most common is to group them according to the nature of their...

Map