at ph 7 what is the charge on an amino acid on the amino and carboxyl group?

Question

eg is it 1- 1+

Answer 1

Well it all depends on the pKas of the amino acid. But mostly at pH 7 most aa are neutral. At low pH the H+ on the carboxylic acid is deprotonated and at high basic pH the H+ of the amine is deprotonated. Thus around ph7 the charge at the carboxylic acid end is -1 and+1 at the amine end of the aa.

Answer 2

Acidic amino acids have decrease pKa's. At a low pH they might have maximum or all of their protons. although, whilst the pH rises, the undemanding answer abstracts those protons and additionally then you definately have a negatively charged molecule. Ex) -OH at a pH of two.3, yet then O- at a pH of seven.4

Answer 3

the total charge on the entire molecule is 0. The amino group will be NH3+, so plus 1, and the carboxyl group will be COO-, so negative 1.

Answer 4

The amine releases its extra proton around pH 4 (+1 at pH 3), the caboxyl proton is released at about pH 10 (-1 at pH 11) IIRC. therefore at pH 7, the charges on the polymerizing portions should be 0. But it has been years since biochemistry, so await other answers to confirm or deny mine.