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... of many cells. Cells are considered the basic units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task. Organs are structures made up of two or more tissues organized to carry out a particular fu ...
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7C2 - Youngomega

... contain four types of large molecules— carbohydrates, lipids, proteins, and nucleic acids—that support cell function. About two thirds of every cell is water. The properties of water are important to cell function. ...
Click here to the PPT
Click here to the PPT

... • There are different types of cells depending on their shape and size. It may be spherical, rod shaped, star shaped and from microscopic to very large cells. The largest cell is the ostrich egg and the smallest cell is mycoplasma gallisepticum. The longest cell is fibre cell in plants and nerve ce ...
The Origin of Life (생명의 기원) Chapter 24
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Discovery Lab - Summit Hill Elementary PTO
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... Inside the cell’s nucleus are thread-like strands called chromosomes. Chromosomes are made up of a chemical called DNA which forms a chemical code. This code determines the shape and function of a cell. It also determines when a cell will divide. When a cell divides the new cell needs a copy of the ...
Cell Organelle Analogy: City Matching Cards Directions: Allow
Cell Organelle Analogy: City Matching Cards Directions: Allow

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Cells as a Basic Unit of Living Organisms

... Schleiden and Schwann are generally accredited as the exponents of the “cell theory”, which states that both plants and animals are made up of aggregations of basic units called cells. Schleiden and Schwann writing in the 19th century, introduced the cell theory, which can be summarised as follows: ...
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File - Ms. Petrauskas` Class

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Notes - LHSdiffbio

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... to the applied fixation method for egg cells, the bacteria cannot be considered appropriately fixed (P. F. Elbers, pers. comm.). order to establish the origin of these In bacteria, free oocytes have been examined at a stage when they are still surrounded by a closed layer of follicle cells. It appea ...
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... Living things are made up of at least one cell. Cells come in many different types. Plant and animal cells are two of the main types of cells. All cells are systems that consist of parts that work together. For example, all cells have a cell membrane, cytoplasm, and genetic material. Each cell part ...
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... this time with phorbol 12-myristate 13-acetate (PMA) co-stimulation. The highest doses of PHA used in this experiment also caused cell death that was dose dependent, even while the IL-2 production peaked. For example, the amount of IL-2 produced per cell increased even as the number of live cells su ...
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... another area of a cell. • Vacuoles—organelles found in some cells—store food, water, and waste material. ...
An Introductory Overview of Cells, Chemical Bonds & Energy Part-I
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... Latin for “poison”. Does not meet all the criteria of “Life” Not made up of cells. Contains DNA or RNA, but not usually both. Require a host to replicate. ...
Cell Structure and Function
Cell Structure and Function

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stem cell, final, dean

... in other ways than just making neurons. Instead of replacing damaged cells, stem cells can provide more of a support system to the already diseased cells. This will help them to survive and not progress further and possibly recover. This is an important process that has been theorized and studies th ...
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Grade 10 Academic Science – Biology

... These organelles are the recycling center of the cell. They digest foreign bacteria that invade the cell, rid the cell of toxic substances, and recycle worn-out cell components. Mitochondria Mitochondria are complex organelles that convert energy from food into a form that the cell can use. They hav ...
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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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