NEET Biology — Genetics & Cell

Cell Structure

What if I told you that you are made of thirty trillion microscopic cities, each running its own power grid, waste disposal, and security detail?

These cities are biological cells. Every cell is wrapped in a selective barrier called the cell membrane, which acts like a city wall with strict gatekeepers.

Deep inside sits the nucleus. This is the town hall, housing the master blueprint of life, DNA.

To run a city, you need electricity. The mitochondria are the power plants, generating chemical energy called ATP.

But how does the city build things? Ribosomes act as tiny factories, reading DNA instructions to manufacture protein molecules.

Once built, these proteins must be shipped. The Golgi apparatus acts like a post office, packaging and addressing them for delivery.

A common mistake is thinking animal and plant cells are identical. Remember, plant cells have a rigid outer cell wall and solar panels called chloroplasts, which animals lack.

So, remember the cellular city: the nucleus directs, mitochondria power, ribosomes build, and the membrane protects. Together, they keep you alive every single second.