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Measurement and Magnification Practice
Measurement and Magnification Practice

... 5. a. Calculate the diameter of the main body of this human egg cell AND the thickness of one section of the zona pellucida. ...
The Cytoskeleton - Dr. Salah A. Martin
The Cytoskeleton - Dr. Salah A. Martin

... a new S phase. Segregating Signalling molecules (e.g., mRNAs) so that they pass into only one of the two daughter cells produced by mitosis. In this way, the two daughter cells can enter different pathways of differentiation even though they contain identical genomes. In at least some developing neu ...
The Cell Theory - North Allegheny
The Cell Theory - North Allegheny

... What Makes Eukaryotic Cells Different? • Much larger • Much more complex • Contain a true nucleus to house the genetic material (DNA) • Linear DNA packaged into chromatin found inside the nucleus • Contains specialized structures in the cytoplasm called organelles to carry out various functions • N ...
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... In unicellular organisms, like many protists and bacteria, specialized parts of the cell perform all of the organism’s vital functions. In multicellular organisms, like humans, specific types of cells are bound to each other to create tissue, which makes up the organs of the vital body systems that ...
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... the human SNAT2 protein can be phosphorylated. Therefore, the aim of this study was to investigate (a) how glucocorticoid and AAD influence SNAT2 activity in cultured skeletal muscle cells, and (b) the possible role of phosphorylation events in these effects. Design: The L6 rat muscle cell model was ...
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CHAPTER 4

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To return to the chapter summary click escape or close this document.
To return to the chapter summary click escape or close this document.

... To return to the chapter summary click escape or close this document. ...
Document
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... • 3) The basal body consists of a rod and a series of rings that anchor the flagellum to the cell wall and the cytoplasmic membrane. Unlike eukaryotic flagella, the bacterial flagellum has no internal fibrils and does not flex. Instead, the basal body acts as a molecular motor, enabling the flagellu ...
Questions - National Biology Competition
Questions - National Biology Competition

... 34. Hibernating animals (that sleep all winter) have tissues containing mitochondria with a membrane protein that accelerates electron transport while blocking the synthesis of ATP. What is the consequence of this? a. Energy is saved because glycolysis and the citric acid cycle shut down. b. Hiberna ...
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PowerPoint Lectures for Biology: Concepts and
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... • Metaphase: The spindle is fully formed; chromosomes are aligned single file with centromeres on the metaphase plate ! • Anaphase: Chromosomes separate from the centromere, dividing to arrive at poles! • Telophase: Cell elongation continues, a nuclear envelope forms around chromosomes, chromosomes ...
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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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