Classification

Question 1

Name 20 aminoacids

Answer 1

Glycine
Alanine
Valine
leucine
Isoluecin
Serine
Thrionine
Thyrosine
Cysteine
Methionine
Aspartate
Asparagine
Glutamate
Glutamine
Lysine
Arginine
Histidine
Phenyl alanine
Tryptophan
Proline

Question 2

R groups on a.a

Answer 2

Gly-H
Ala-ch3
Val-ch3.ch.ch3
Leu-ch3 right ch2
Ile-ch3 left ch2
Ser-ch2.oh
Thr-ser h jumbed to left ch3.ch
Cys-ch2. Sh
Met-ch2.ch2. S.ch2
Asp-beta carboxyl
Asn-bata coo.nh2
Glu-gama carboxyl
Gln-gama coo.nh2
Lys-epsilon nh3+
Arg-gama NH.nh2c=nh2
His-pent. Nh-=n
Phe-phenyl
Tyr-phenol
Trp-indole(phenyl+pent nh)
Pro-pent nh

Question 3

No charge on r group

Answer 3

Ala
Leu
Iso

Question 4

Essential a.a

Answer 4

A.V.HILL.MP.TT

Question 5

Is h20 an organic solvent

Answer 5

No

Question 6

Is a.a.soluble in h2o

Answer 6

Yes

Question 7

A.a are soluble in organic solvent.true?

Answer 7

No .a.a are insoluble in organic solvent

Question 8

A.a melt at high temp. True?if yes then upto when

Answer 8

Yes.often above 200

Question 9

Taste of a.a

Answer 9

Sweet-gly,Ala,val
Tasteless-leu
Bitter-arg,Ile

Question 10

MSG used as flavouring agent.common name?

Answer 10

Monosodium glutamate(ajinomoto)

Question 11

A.a which does not show optical isomers.reason?

Answer 11

Glycine.Dye to the presence of assymmetric carbon atom

Question 12

Define ampholite

Answer 12

A.a with both acidicand basic

Question 13

Zwitter ion/dipolar ion.

Answer 13

*hybrid molecule
*+ve(in acidic) and -ve(in basic) ions
*free carboxylic and free aminogroup

Question 14

Isoelectric pH

Answer 14

pHat which molecule exist as zwitter ions or dipolar ions
*no net charge
*electrically neutral

Question 15

Reaction due to carboxyl group

Answer 15

*A.a form salt with base eg.coona
Form esters with bases
*decarboxylation-to form amides
Eg.histamine ,GABA,thyramine
*rectn with nh3:relation bw acid and amides
Eg aspartate +nh3=Asn

Question 16

Reaction due to nh2 group

Answer 16

*behave as bases and forms salt
*transamination:transfer of amino group to keto acid to formnew a.a
*Oxidate deamination:Liberate nh2
*form rahumanns purple:reactn with ninhydrin(purple blue or pink complex)