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Notes Pages
Notes Pages

... Organ Systems are combinations of organs working together to perform certain ...
Cell Organelles
Cell Organelles

... and store them in vesicles, or small pockets. In my spare time, I create lysosomes.” 5) “I am always hungry. That is because I am a tiny vesicle called a lysosome that is full of enzymes. I use my enzymes to break down food into nutrients. I float around in the cytoplasm waiting for food to digest. ...
Cell Wall Ribosomes Nucleus Chloroplast Cytoplasm Endoplasmic
Cell Wall Ribosomes Nucleus Chloroplast Cytoplasm Endoplasmic

... cell wall in a plant cell. Similar to the cell of a cell by breaking down things that the cell no longer animal cells do not. Chlorophyll is the substance found wall, it protects the cell and controls what needs. in green plants that allows them to make their own food, passes in and out of the cell. ...
Solar Energy Project - sustainabilitylessons
Solar Energy Project - sustainabilitylessons

... exist in sunlight everywhere, and the amount of energy in each photon depends on the wavelength that they exist in. ...
Getting to Know: Cell Theory
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... them all made of the same cell. In fact, there are many different kinds of cells. Unicellular organisms consist of just one cell. These cells go through life cycles just like more complex organisms. They grow and reproduce and then eventually die. Most one-celled organisms can’t be seen without a mi ...
Cell Size, Cell Cycle, and Uncontrolled Cell Division
Cell Size, Cell Cycle, and Uncontrolled Cell Division

... A disorder in which some of the body’s own cells lose the ability to control growth. These cells do not respond to the regulators of normal cells Tumors can grow and cause damage to normal tissues. ...
Biology Chapter 7: Cell Structure and Function
Biology Chapter 7: Cell Structure and Function

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Scientific Inquiry

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Handout: Organelle List
Handout: Organelle List

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< 1 ... 935 936 937 938 939 940 941 942 943 ... 1231 >

Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
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