AIIMS Practice Quiz

Question 1

Which cell organelle is primarily responsible for ATP synthesis through oxidative phosphorylation in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 2

Ribosomes attached to the rough endoplasmic reticulum mainly synthesize proteins that are:

Accepted Answer

Destined for secretion, membranes, or lysosomes

Question 3

A mutation destroys the signal peptide that normally directs a lysosomal enzyme into the rough ER. What is the most likely immediate consequence?

Accepted Answer

The enzyme will remain in the cytosol after synthesis on free ribosomes

Question 4

In electron micrographs, the inner mitochondrial membrane appears highly folded into cristae. The principal advantage of this arrangement is that it:

Accepted Answer

Increases surface area for electron transport and ATP synthesis

Question 5

Which statement correctly distinguishes smooth endoplasmic reticulum from rough endoplasmic reticulum?

Accepted Answer

Smooth ER is involved in lipid synthesis and detoxification

AIIMS