Prokaryotic Cells: Simpler, smaller, lack nucleus and organelles. DNA in nucleoid. Examples: Bacteria, Archaea.
Eukaryotic Cells: Complex, larger, have nucleus and organelles. DNA in nucleus. Examples: Animals, plants, fungi, protists.
The plasma membrane is called a selectively permeable membrane because it acts like a picky gatekeeper for the cell. It only allows certain things to pass through, while blocking others.
Why is the plasma membrane called a selectively permeable membrane? Read More »
Diffusion is like perfume spreading in a room. Osmosis is water moving through a sponge. Facilitated diffusion is when big molecules use special doors to enter or exit, like using a key for a locked door.
How do substances like CO2 and water move in and out of the cell Read More »
The cell is called the structural and functional unit of life because it is the smallest unit capable of carrying out all the functions necessary for life. Each cell is capable of metabolism, reproduction, responding to stimuli, and maintaining homeostasis.
Why is the cell called the structural and functional unit of life? Read More »
Cells were first discovered by Robert Hooke in 1665. He observed thin slices of cork under a microscope and noted that they were made up of tiny compartments resembling the cells (rooms) of a monastery, hence the term “cell.”
Who discovered cells, and how? Types of Cell – Timeline of Cell Read More »
