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The Phospholipid Bilayer - Advanced
The Phospholipid Bilayer - Advanced

... Cytosol and extracellular fluid - the insides and outsides of the cell - are made up of mostly water. In this watery environment, the water loving heads point out towards the water, and the water fearing tails point inwards, and push the water out. The resulting double layer is called a phospholipid ...
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... ions to the outside. The phosphorylated form of the pump has a low affinity for Na+ ions, so they are released. • The pump binds 2 extracellular K+ ions. This causes the dephosphorylation of the pump, reverting it to its previous conformational state, transporting the K+ ions into the cell. • The un ...
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... 2. How do humans get the nitrogen they need? Plants can take up these forms of nitrogen and use it to make their molecules (see below). Heterotrophs (like humans) get their nitrogen FROM EATING plants or other heterotrophs. 3. Give examples (3) of some molecules your body needs nitrogen to make. Pro ...
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Transport across the Plasma Membrane
Transport across the Plasma Membrane

... 3. When preparing a wet mount, the cover slip should be put on at an angle to avoid ______. 4. The ______ contains the DNA and controls the cell. 5. Diffusion is the movement of molecules from a ______ to a _______ concentration. 6. If a cell has 95% water and it is placed in a hypertonic solution, ...
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Signal transduction



Signal transduction occurs when an extracellular signaling molecule activates a specific receptor located on the cell surface or inside the cell. In turn, this receptor triggers a biochemical chain of events inside the cell, creating a response. Depending on the cell, the response alters the cell's metabolism, shape, gene expression, or ability to divide. The signal can be amplified at any step. Thus, one signaling molecule can cause many responses.
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