1
RE-NEET 2026
MCQ (Single Correct Answer)
+4
-1

The correct statement about peptides and proteins is

A

In $\alpha$-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds

B

Tertiary structure of proteins has two or more polypeptide subunits

C

Only the proteins having a quaternary structure are biologically active

D

In $\beta$-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds

2
RE-NEET 2026
MCQ (Single Correct Answer)
+4
-1

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

A

serine

B

leucine

C

threonine

D

methionine

3
RE-NEET 2026
MCQ (Single Correct Answer)
+4
-1

$$ \text { Match the vitamins in List I with their sources in List II } $$

$$ \begin{array}{|l|l|l|l|} \hline & \text { List I } & & \text { List II } \\ \hline \text { A. } & \text { vitamin A } & \text { I. } & \text { meat } \\ \hline \text { B. } & \text { vitamin B }{ }_{12} & \text { II. } & \text { sunflower oil } \\ \hline \text { C. } & \text { vitamin E } & \text { III. } & \text { green leafy vegetables } \\ \hline \text { D } & \text { vitamin K } & \text { IV. } & \text { carrots } \\ \hline \end{array} $$

Choose the correct answer from the options given below.

A

A-III, B-I, C-IV, D-II

B

A-II, B-III, C-IV, D-I

C

A-IV, B-I, C-II, D-III

D

A-IV, B-II, C-I, D-III

4
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct statement with regard to the secondary structure of DNA/RNA is

A

RNA possesses a single strand helix structure and contains thymine as one of the four bases

B

DNA possesses a double strand helix structure and contains thymine as one of the four bases

C

RNA possesses a double strand helix structure and contains uracil as one of the four bases

D

DNA possesses a single strand helix structure and contains uracil as one of the four bases

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