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Test 1 answers_ marksheme
Test 1 answers_ marksheme

... a) List two features that are common to both prokaryotic and eukaryotic cells 1. cell membrane 2. cytoplasm 3. ribosomes 4. DNA I also allowed flagella as some prokaryotic cells and some eukaryotic cells can have these but all of either do not. If wording had ask common to all pro and euk cells then ...
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The primary cell wall

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Name: : :__
Name: : :__

... Click on “Plant Cell” underneath the diagram to view a plant cell. 1. Move your mouse over the plant cell to see the names of the organelles. Name five organelles found in a plant cell that were also studied in the animal cells questions above. ...
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A Novel MEMS Micromirror Optical Switch

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m5zn_c761eca58f276e9

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... concentrated host cells and plasma, (iv) rapid degradation in vivo, and (v) high manufacturing cost due to chemical complexity (e.g. crosslinking and cyclization). We show that a major impediment to clinical utility is that all microbicidal peptides lose activity in the presence of concentrated eryt ...
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Cellular differentiation



In developmental biology, cellular differentiation isa cell changes from one cell type to another. Most commonly this is a less specialized type becoming a more specialized type, such as during cell growth. Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types. Differentiation continues in adulthood as adult stem cells divide and create fully differentiated daughter cells during tissue repair and during normal cell turnover. Some differentiation occurs in response to antigen exposure. Differentiation dramatically changes a cell's size, shape, membrane potential, metabolic activity, and responsiveness to signals. These changes are largely due to highly controlled modifications in gene expression and are the study of epigenetics. With a few exceptions, cellular differentiation almost never involves a change in the DNA sequence itself. Thus, different cells can have very different physical characteristics despite having the same genome.A cell that can differentiate into all cell types of the adult organism is known as pluripotent. Such cells are called embryonic stem cells in animals and meristematic cells in higher plants. A cell that can differentiate into all cell types, including the placental tissue, is known as totipotent. In mammals, only the zygote and subsequent blastomeres are totipotent, while in plants many differentiated cells can become totipotent with simple laboratory techniques. In cytopathology, the level of cellular differentiation is used as a measure of cancer progression. ""Grade"" is a marker of how differentiated a cell in a tumor is.
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