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Molecular Biology

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Submitted By fancynancy
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Homework 1
Question 2. Phagocytosis is when larger solid particles are taken into the cell by being surrounded by the plasma membrane and passing through. Endocytosis is when smaller more soluble particles are taken in by the plasma membrane forming a sort of hole and then the hole is pinched off containing the smaller particles turning into a vesicle which is taken where it needs to go.
Question 5. A scientist might choose light-microscopy over electron microscopy because you can use living cells and watch how different factors affect them. Electron microscopy might be used because it has better resolution so you can see more details and depth to determine what the sample really looks like.
Question 7. Basic light microscopes require chemical staining because most of the cells are not visible under normal light conditions. The cell material doesn’t absorb visible light so they look invisible. Another way of visualizing samples is by using fluorescence. Most of the chemical stains bind to the whole molecule or group of molecules instead of a specific part or specific molecule. You can go around this problem by using fluorescent microscopy. The fluorescent marker can be attached to a specific place or molecule so that you only see the part that you want too because if you are using a fluorescent microscope you will only see the part or molecule that fluoresces. Confocal scanning and deconvolution microscopy make fluorescent microscopy better by allowing you to focus on a specific region or depth of the sample. This makes what you see sharper and you can use this type of microscopy on thicker samples because you can focus on a more specific layer.
Question 9. A cell line can keep dividing in the same sample so you continue to have live samples. A cell strain is like a family of cells that keeps going generation after generation. It starts with one

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