OCR Biology Cells Revision Notes

• 1Cells are classified into prokaryotic and eukaryotic types.
• 2Eukaryotic cells contain membrane-bound organelles, including the nucleus.
• 3Prokaryotic cells lack a nucleus and are generally smaller than eukaryotic cells.
• 4Cell membranes are selectively permeable, regulating the movement of substances in and out.
• 5Cellular processes include respiration, protein synthesis, and cell division.

Cells are like tiny factories that make up all living things. There are two main types of cells: prokaryotic, which are simple and do not have a nucleus, and eukaryotic, which are more complex and have a nucleus and other parts called organelles. These organelles help the cell perform different jobs, like making energy or proteins. Understanding cells is important because they are the building blocks of life.