Dec 1, 2025 · What is a cell? A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all …

Dec 10, 2025 · A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things.

cell, In biology, the basic unit of which all living things are composed; the smallest structural unit of living matter that is able to function independently.

Cell differentiation is a crucial part of development in multicellular organisms, since it results in cells with unique characteristics—such as muscle cells, neurons, or red blood cells —and thereby enables …

Every organism, or living thing, is made up of structures called cells. The cell is the smallest unit with the basic properties of life. Some tiny organisms, such as bacteria…

Cell theory states that the cell is the fundamental structural and functional unit of living matter.

Nov 25, 2025 · First proposed by German scientists Theodor Schwann and Matthias Jakob Schleiden in 1838, the theory that all plants and animals are made up of cells marked a great conceptual advance …

Dec 10, 2025 · It serves as a barrier to keep the contents of the cell in and unwanted substances out. It also functions as a gate to both actively and passively move molecules, such as essential nutrients, …

Nov 20, 2025 · All living organisms on Earth are made up of one of two basic types of cells: eukaryotic cells, in which the genetic material is enclosed within a nuclear membrane, or prokaryotic cells, in …

Dec 10, 2025 · Cell - Structure, Organelles, Metabolism: Like the cell membrane, membranes of some organelles contain transport proteins, or permeases, that allow chemical communication between …