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a thin, phospholipid bilayer, membrane around the cytoplasm of a cell that regulates what enters and exits the cell.
a cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another.
organelle found in some plant cells and certain unicellular organisms where photosynthesis takes place.
a process in which a membrane allows some molecules to pass through while keeping others out.
The stage of the cell cycle that takes place before cell division occurs; during this stage, the cell grows, copies its DNA, and prepares to divide.
The stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle (third step).
Thin, hollow cylinders made of protein that provide structural support for eukaryotic cells.
Diffusion of water through a selectively permeable membrane from a high concentration to a low concentration.
The final stage of mitosis or meiosis during which a nuclear membrane forms around each set of new chromosomes.
States that all organisms are made up of one or more cells, the cell is the basic unit of life, and all cells come from other cells.
Solid rod of protein, thinner than a microtubule, that enables a cell to move or change shape.
When substances transport across cell membranes using protein carrier molecules.
The first phase of mitosis. During prophase the replicated chromosomes condense, the spindle is formed, and the nuclear envelope breaks apart into vessicles.
Movement of particles from an area of high concentration to an area of lower concentration.
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