Pakistan MCQs

White blood cells identify and attack pathogens.
Different types act through phagocytosis or immune responses.

The nucleus contains most of the cell's genetic material.
It directs protein production and cell activities.

Mitochondria produce much of the cell's ATP through respiration.
ATP supplies usable energy for cellular work.

Ribosomes join amino acids according to genetic instructions.
They may be free in the cytoplasm or attached to rough ER.

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

The plant cell wall is mainly made of cellulose.
It supports the cell and helps prevent bursting.

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

Diffusion is driven by random particle motion.
Net movement continues down a concentration gradient.

Osmosis is a special case of water movement across a membrane.
It affects cell volume and water balance.

Water enters the cell and enlarges the vacuole.
The cell contents press against the wall, making the cell turgid.

Tissues consist of coordinated cells with related roles.
Examples include muscle tissue and epithelial tissue.

Microorganisms use sugars during fermentation.
The process is used in bread, yogurt, and other foods.