Dec 10, 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 …

Jun 14, 2025 · Explore the structure, types, and functions of cells in this student-friendly guide to cell biology and cell theory.

Cell theory, developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure …

Apr 9, 2025 · Explore the structures and functions of 24 cell organelles with detailed diagrams, enhancing your understanding of cellular components in biology.

HeLa cells represent just one of the thousands of different eukaryotic cell types found on Earth. Each of the videos featured in this narrative were created using actual cellular data which …

A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even …

For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology. This unit is part of the Biology archive. Browse videos and articles by topic.

Dec 30, 2025 · Cells help in the formation of the structure of an organism. A cell is a membrane-bound organelle that has other cell organelles, which perform different functions.

Jul 18, 2023 · Living things consist of tiny living parts or compartments called cells. A cell itself consists of certain tiny parts or structures called organelles. These organelles perform various …

A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, and so on.