MDCAT Biology MCQs

Mitochondria convert energy from nutrients into ATP.
They contain their own DNA and ribosomes.

The plasma membrane is selectively permeable.
It regulates exchange between the cell and its environment.

Ribosomes translate mRNA into polypeptide chains.
They occur freely in cytoplasm or attached to rough ER.

Chloroplasts contain chlorophyll and photosynthetic membranes.
They convert light energy into chemical energy.

The plasma membrane is selectively permeable.
It regulates exchange between the cell and its environment.

Rough ER has ribosomes attached to its surface.
It folds and modifies proteins entering the endomembrane system.

Phospholipids form a bilayer with hydrophilic heads and hydrophobic tails.
Proteins and other molecules are embedded within it.

Rough ER has ribosomes attached to its surface.
It folds and modifies proteins entering the endomembrane system.

Phospholipids form a bilayer with hydrophilic heads and hydrophobic tails.
Proteins and other molecules are embedded within it.

Rough ER has ribosomes attached to its surface.
It folds and modifies proteins entering the endomembrane system.

Phospholipids form a bilayer with hydrophilic heads and hydrophobic tails.
Proteins and other molecules are embedded within it.

Smooth ER lacks ribosomes.
It synthesizes lipids and helps detoxify chemicals.