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

Alpha-helix is found in which level of protein structure?

A

Secondary structure

B

Tertiary structure

C

Primary structure

D

Quaternary structure

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

The main function of bulliform cells in grasses is :

A

to make the leaf impermeable to fungal spores.

B

to transport water.

C

to perform photosynthesis.

D

to minimize water loss during water stress.

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

Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :

A

Extension → Annealing → Denaturation

B

Annealing → Denaturation → Extension

C

Denaturation → Extension → Annealing

D

Denaturation → Annealing → Extension

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

$$ \text { Match List I with List II : } $$

List-I
(Phase of cell cycle)
List-II
(Activity)
A. $\mathrm{G}_1$ phase I. Actual cell division occurs
B. S phase II. Cell is metabolically active and continuously grows but does not replicate its DNA
C. $\mathrm{G}_2$ Phase III. Synthesis of DNA occurs and the amount of DNA per cell doubles
D. M phase IV. Proteins are synthesized while cell growth continues

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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