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Learn about the nucleus and ribosomes in cells on Khan Academy.
Khan Academy
Let's learn about the structure and function of the eukaryotic cell's nucleus. Discover the role of the outer and inner membranes, the nucleoplasm, and the nuclear pore in isolating the nucleus and facilitating transport.
Cell parts and their functions - Khan Academy
Within cells, special structures are responsible for particular functions. For example, mitochondria help release energy that the cell can use for other tasks, and the nucleus contains the genetic information. The cell membrane forms the boundary that controls what enters and leaves the cell. In plant cells, chloroplasts enable photosynthesis and the cell wall provides structure.
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Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, the dense region at the center of an atom. Electrons are found outside the nucleus. Protons are positively charged and have a mass of about 1 u.
Phases of the cell cycle - Khan Academy
In eukaryotic cells, or cells with a nucleus, the stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase. During interphase , the cell grows and makes a copy of its DNA.
Anatomy of a neuron - Khan Academy
Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons).
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Cellular organelles and structure - Khan Academy
Learn about the structure and function of cellular organelles, including the nucleus, mitochondria, and endoplasmic reticulum.
Khan Academy
Viruses are infectious agents that can only replicate inside the living cells of an organism.
Phases of mitosis - Khan Academy
How a cell divides to make two genetically identical cells. Prophase, metaphase, anaphase, and telophase.