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Chitin is a component of ______ cell walls
Chitin is a component of ______ cell walls

... d. Ribosomes are sometimes attached to the smooth ER. e. Both the plasma membrane and nuclear envelope are phospholipid bilayers. 5. Folded membranes are an advantage to a cell because _______ (circle all that apply). a. cell processes can be more efficient. b. the membranes provide a large surface ...
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10. Use a different colour for each stage of

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... on their own. They need other living cells for reproduction. Different viruses Period # ____ Date: ____/_____/____ attack different types of cells. The virus below is a bacteriophage. It is shown attacking itʼs host bacterial cell ...
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... Infection Biology (HKI), Beutenbergstrasse 11a, 07745 Jena Germany How to localize a protein on a cell membrane? Cell membranes incorporate many proteins of different size. In order to directly differentiate between different proteins, the molecule of interest is usually specifically labeled. Howeve ...
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Lecture Notes (PDF format)

... The shr tissue layer affected by the mutation has characteristics of the cortex and does not produce an endodermis. Additionally, the double mutant fass shr that produces extra cells now available to differentiate into an endodermis if the positional signal to do so was forthcoming, do not do so. He ...
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cell structure and tissue
cell structure and tissue

... reproducing, compose all living things, from single-celled plants to multibillion-celled animals. The human body, which is made up of numerous cells, begins as a single, newly fertilized cell. Almost all human cells are microscopic in size. To give you an idea how small a cell is, one average-sized ...
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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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