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1.

Which of the following is the major solute species in a solution of alanine at `pH=2` ?A. B. C. D.

Answer» Correct Answer - 1
In acidic `(pH=2)` medium `NH_(2)` groups accepts `H^(+)`
Discussion
2.

Which of the statement is incorrect.A. Fructose on reduction with `NaBH_(4)` gives only one product.B. Solubility of amino acid at its isoelectric point is minimum.C. Guanidline is more basic than diethyl amineD. Mutarotation is observed in the aqueous solution of glucose.

Answer» Correct Answer - A
Statement `2,3 & 4` are correct by definition and concept.
Discussion
3.

The incorrect structure of glycine at given `pH` are `:`A. `H_(3)overset(o+)(N)CH_(2)-underset(underset(O)(||))(C)-OH" at"pH=2.0`B. `H_3overset(o+)(N)CH_(2)-underset(underset(O)(||))(C)-O^(ɵ)" at "pH=6.0`C. `H_(2)NCH_(2)-underset(underset(O)(||))(C)-O^(ɵ)" at "pH=9`D. `H_(2)NCH_(2)-underset(underset(O)(||))(C)-OH" at "pH=12`

Answer» Correct Answer - 4
At acici `pH` , glycine will convert to cation and at basic pH glycine will convert to anion.
Discussion
4.

Which of the structure represent methyl `alpha -D-` galactopyranoside ? A. aB. bC. cD. d

Answer» Correct Answer - 4
Discussion
5.

The above process in which `alpha` and `beta` form remain in equilibrium with acyclic form and a change in optical rotation is observed which is known as`-`A. MutarotationB. EpimerisationC. Saccharic acidD. Gluconic acid

Answer» Correct Answer - 1
The above phenomenon is called mutarotation in which specific rotation of the solution changes.
Discussion
6.

What is the complementary `m-RNA` sequence for the DNA segment AATCAGTT?A. AAUCAGUUB. CCAUCGAAC. AACUGAUUD. UUAGUCAA

Answer» Correct Answer - 1
DNA Segment`" "`AATCAGTT
mRNA Segment`" "` AAUCAGUU
Here thiarrine is replaced by uracil
Discussion
7.

Which of the following is vitamin A ?A. B. C. D.

Answer» Correct Answer - 4
Discussion
8.

Which two of the following compounds, if any, are epimers ? A. `1 & 4`B. `1&3`C. `2&3`D. `3&4`

Answer» Correct Answer - 4
Epimers are diastereomers which differs in configuration about only one chiral center.
Discussion
9.

An amino acid is characterized by two `pKa` values the one corresponding to the more acidic site is designated as `pKa_(1)` and the other corresponding to the less site is designated as `pKa_(2)`. Some amino acids have side chain with acidic or basic groups. These amino acids have `pKa_(3)` value also for the side chain. `|{:(S.No,"Amino acid",P^(Ka1),P^(Ka2),P^(Ka3)" (Side chain)"),(I,"Aspartic acid",1.88,9.6,3.65),(II,"Glutamic acid",2.19,9.67,4.25),(III,"Lysine",2.18,8.95,10.53),(IV,"Arginine",2.17,9.04,12.48):}|` The isoelectric point `(pI)` of Aspartic acid and lysine will be respectively `:`A. `6.62 & 9.74`B. `2.77 & 5.6`C. `2.77 & 9.74`D. `9.74 & 6.62`

Answer» Correct Answer - 3
For acidic amino acid.
`P^(1)=(p^(Ka_(1))+p^(Ka_(3)))/(2)=(1.88+3.65)/(2)=(5.53)/(2)=2.77`
For basic amino acids
`P^(1)=(p^(Ka_(2))+p^(Ka_(3)))/(2)=(8.95+10.53)/(2)=(19.48)/(2)=9.74`
Discussion
10.

Product P & Q may be grouped as A. DiastereomersB. EnantiomersC. AnomersD. None of these

Answer» Correct Answer - A
Not mirror image stereoisomers are known as diastereomers.
Discussion
11.

How many moles of acetic anhydride `(Ac_(2)O)` is needed to react completely with tataric acid, ribose and glucose respectively, A. 2,4,5B. 2,3,4C. 4,5,6D. 4,5,5

Answer» Correct Answer - 1
Depends upon number of `-OH` group.
Discussion
12.

Test by which starch and cellulose can be distinguished from each other is `:A. reducing sugar testB. analysis of products of hydrolysisC. iodine testD. Molisch test

Answer» Correct Answer - 3
Starch gives iodine test but cellulose does not.
Discussion