Biomolecules · Question 25

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

1. NH2-CH2-COOH and NH2- CH3 |CH-COOH
2. NH2-CH2-COCl and NH3- CH3 |CH-COCl
3. NH2-CH2-COCl and NH2- CH3 |CH-COOH
4. NH2-CH2-COOH and NH2- CH3 |CH-COCl

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is . 5'-G-G-C-A-A-A-T-C-G-G-C-T-A-3'

A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. [figure] Based on the information given, the dipeptide "x" is :

1. alanine-alanine
2. valine-glycine
3. valine-leucine
4. alanine-glycine

Which of the following is the correct structure of L-Fructose?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Fat soluble vitamins are: Choose the correct answer from the options given below:

1. B & C Only
2. C & D Only
3. C & E Only
4. A & B Only

Identify the correct statement among the following :

1. All naturally occurring amino acids except glycine contain one chiral centre.
2. Amino acid, cysteine can easily undergo dimerisation due to the presence of free SH group.
3. Glutamic acid is the only amino acid that contains a –COOH group at the side chain.
4. All naturally occurring amino acids are optically active.

A tetrapeptide, "x" on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is:

1. 32
2. 24
3. 8
4. 16

Match List - I with List - II. Choose the correct answer from the options given below :

1. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
2. (A)-(III), (B)-(III), (C)-(I), (D)-(IV)
3. (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
4. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

1. Statement I is true but Statement II is false
2. Both Statement I and Statement II are true
3. Statement I is false but Statement II is true
4. Both Statement I and Statement II are false

Match List-I with List-II. Choose the correct answer from the options given below :

1. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
2. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
3. (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
4. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)