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Amino Acids and their types

ln zwitterion...

Question

ln zwitterionic form of tryptophan, the functional groups observed at the two ends are

A

aldehyde and ketone group

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B

carboxytic group only

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C

amino and carboxylic group

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D

aldehyde and amino group

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Solution

The correct option is C amino and carboxylic group
In zwitterionic form of an amino acid, one end will have amino group and the other end will have carboxylic group. Hence, in the zwitterionic form of tryptophan, the functional groups observed at the two ends are an amino and carboxylic group.

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Q. In zwitterionic form tryptophan, the functional groups observed are

Q. What is the functional group present in tryptophan?

Select the correct statements regarding zwitterion.

(i) Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules.
(ii) A zwitterion can act either as a proton donor or proton acceptor.
(iii) A monoamine monocarboxylic

α

-amino acid is a acid at high pH as both the groups (amino and carboxyl) lose a proton.
(iv) Amino acids in solution at neutral pH exist predominantly as dipolar ions, the amino group is protonated

(N H_{3}^{+})

and the carboxyl group is deprotonated

(- C O O^{-})

.

Q. Which of the following are correct with reference to amino acid?
a. Amphoteric in nature
b. Are substituted methane molecules.
c. Serine is an alcoholic amino acid.
d.Amino acids never exist in zwitterionic form at any stage in living cells.
e. A dipeptide comprises of two peptide bonds between amino acids.

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