Biochemistry - Structure and Properties of Amino Acids - Discussion

Discussion Forum : Structure and Properties of Amino Acids - Section 1 (Q.No. 1)
When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes
a cation
a zwitterions
an isotope
Answer: Option
No answer description is available. Let's discuss.
14 comments Page 1 of 2.

Mamta kushwah said:   1 decade ago
Because they have pka value is up to 6.7 .

GEOFREY COSMAS said:   10 years ago
The alanine become zwitterionic character because at 7.3 the carboxylic group already ionized and the amino group is still protonated contribution the neutrality, which we call as its ISOELECTRIC POINT. FROM Tanzania.

Regina Sanco said:   10 years ago
The alanine becomes zwitter because at a PH of app 7.3, the carboxyl group COOH of alanine becomes fully deprotonated (a proton is removed) forming COO- whiles the amino group becomes fully protonated forming an NH3+.

JAPAN MAHINDA said:   9 years ago
At ph 7.3 is nearly physiological and alanine exist as a zwitterion as NH3+- C-COO-, SO THE NH3+ and the COOH- CREATES A DIPOLE(ZWITTERION).

VISHAL said:   9 years ago
Because they are having both the positive and negative charges.

Wanyama Emmanuel said:   8 years ago
When the amino acid is placed in a solution at physiologic pH, the carboxyl group loses its hydrogen to the amino group, hence it becomes negatively charged while the amino group gets a positively charged.

Kate Wanjiku said:   8 years ago
Because at neutral PH alanine can either act as a base or as an acid.

Wangu said:   7 years ago
The amino group gains hydrogen ion that is lost from the carboxyl group.

Lama shatat said:   7 years ago
Because at physiologic pH ( ~ pH = 7.4), the carboxyl group is dissociated, forming the negatively charged carboxylate ion(-COO-) and the amino group is protonated(-NH3+).

ABHIMANYU batra said:   6 years ago
Nice explanation. Thank you all.

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