1
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

The very first step of initiation of translation is

A

binding of tRNA to AUG codons on mRNA.

B

binding of mRNA to larger subunit of ribosome.

C

binding of mRNA to smaller subunit of ribosome.

D

binding of two ribosomal subunits.

2
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Given below are two statements.

Statement I - In Meselson and Stahl's experiment the samples were separated by using CsCl equilibrium gradients.

Statement II - ${ }^{15} \mathrm{~N}$ is a heavy isotope and can be separated based on density gradient.

In the light of above statements, select the correct option given below:

A

Both statement I and statement II are correct.

B

Both statement I and statement II are incorrect.

C

Statement I is correct but statement II is incorrect.

D

Statement I is incorrect but statement II is correct.

3
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Exons on hnRNA codes for $\qquad$

A

lipid

B

sugar

C

protein

D

phospholipid

4
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

In an operon, when repressor protein attaches to the operator then __________ .

A

the operator is switched on.

B

the structural genes are expressed.

C

the chemical inducer is synthesized.

D

the structural genes are not expressed.

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