Pakistan MCQs

Phagocytosis is often called cell eating.
Immune cells use it to engulf microbes and debris.

Pinocytosis is often called cell drinking.
Small vesicles form from the plasma membrane.

Water enters the cell by osmosis.
Without a cell wall, excessive water entry can cause lysis.

Cellulose microfibrils provide strength to plant cell walls.
The wall supports and protects the cell.

Water moves out toward the higher solute concentration.
The cell undergoes crenation.

Fungal cell walls contain chitin and other polysaccharides.
Chitin is also found in arthropod exoskeletons.

Water enters the cell and the vacuole expands.
The cell wall prevents bursting and creates turgor pressure.

Peptidoglycan forms a strong mesh around bacterial cells.
Its thickness differs between Gram-positive and Gram-negative bacteria.

Plasmolysis occurs in a hypertonic environment.
The vacuole shrinks and the membrane pulls inward.

Cytoplasm includes the cytosol and suspended structures.
Many metabolic reactions occur there.

The cytoskeleton includes microtubules, microfilaments, and intermediate filaments.
It supports transport, division, and movement.

Microtubules form tracks for motor proteins.
They also form the mitotic spindle, cilia, and flagella.