NET Applied Sciences MCQs

The plasma membrane surrounds material and pinches inward.
Phagocytosis and pinocytosis are forms of endocytosis.

Exocytosis secretes hormones, enzymes, and neurotransmitters.
It also adds membrane components to the cell surface.

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.

All organisms are made of one or more cells.
Cells perform the fundamental processes required for life.

Modern cell theory states that cells come from existing cells.
Cell division provides continuity of life.

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

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

Membrane components can move laterally within the bilayer.
The membrane is flexible rather than rigid.

The nucleus stores chromosomes in eukaryotic cells.
It also regulates gene expression and cell activities.

The nucleolus is a dense region inside the nucleus.
It produces rRNA and assembles ribosomal subunits.