Explanation

Main Parts of a Cell:

Last verified on 09-05-2026

Explanation

• The nucleus is the control center of the cell.
• It regulates all vital activities like growth, reproduction, and metabolism.
• It contains genetic material (DNA).
• Ribosomes make proteins, and cytoplasm supports cell structure.

Last verified on 04-05-2026

Explanation

• The longest cell in the human body is the nerve cell (neuron).
• Some neurons can extend up to 1 meter in length.
• They transmit impulses throughout the body.

Additional information:

• The smallest cell in the human body is the sperm cell (spermatozoon).
• It is measures approximately 4–5 micrometers (µm) in length.
• It is mainly consisting of a nucleus and a tail.

Last verified on 23-04-2026

Explanation

Chromosomes are made up of:

• Nucleic acid (DNA or RNA)
• Proteins (histones and non-histone proteins)

A chromosome is made up of proteins and DNA organized into genes.

Each cell normally contains 23 pairs of chromosomes.

Explanation

O negative (O⁻) blood group is called the universal donor.

It can be transfused to any blood group (A, B, AB, or O).

O⁻ lacks A, B, and Rh antigens, preventing immune reactions in recipients.

Explanation

The lifespan of white blood cells ranges from 13 to 20 days, after which time they are destroyed in the lymphatic system.

When immature WBCs are first released from the bone marrow into the peripheral blood, they are called "bands" or "stabs."

Explanation

An atom consists of three subatomic particles:

1. Protons (positively charged)
2. Neutrons (neutral)
3. Electrons (negatively charged)

Additional Information:

A neutral atom has equal protons and electrons; imbalance creates ions.

Discovered by John Dalton in 1808 (Atomic Theory).

Cation = positive ion,
Anion = negative ion,
Isotopes = same element with different neutrons,

Explanation

A vacuole is a sac-like organelle in cells that stores waste materials, water, and nutrients before they are removed or used by the cell.

It plays a key role in maintaining cell homeostasis.

Explanation

The cell is the smallest unit of life.

Cells are called ‘structural’ and ‘functional’ units for a reason.

Cells are made of molecules which are in turn made up of atoms.

“Cell is the unit of LIFE” is that a cell is the smallest living entity in a living system.

Explanation