Biomolecules

Identify the correct statements. Choose the correct answer from the options given below :

1. A and B Only
2. B and C Only
3. A, B and D Only
4. A, B and E Only

Identify the incorrect statement about tertiary structure of proteins.

1. They can be fibrous or globular in structure.
2. The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.
3. The structure remains intact when exposed to pH changes.
4. A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

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

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

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

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

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

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

A D-aldotetrose on oxidation with concentrated HNO3 resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

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

Match List - I with List - II.

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

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A). (T and Y represent one letter code for amino acids)

1. Amino acid (A) - T Hormone (B) - Insulin
2. Amino acid (A) - T Hormone (B) - Thyroxine
3. Amino acid (A) - Y Hormone (B) - Thyroxine
4. Amino acid (A) - Y Hormone (B) - Insulin

In the given pentapeptide, find out an essential amino acid (Y) and the sequence present in the pentapeptide : [figure] Choose the correct answer from the options given below :

1. arrayll(Y) & (Sequence) \ Serine & Thr-Ser-Asp-Ala-Gly array
2. arrayll(Y) & (Sequence) \ Serine & Ser-Asp-Thr-Ala-Gly array
3. arrayll(Y) & (Sequence) \ Threonine & Ser-Thr-Asp-Gly-Ala array
4. arrayll(Y) & (Sequence) \ Threonine & Thr-Ser-Asp-Gly-Ala array

Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :

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