Introductory Biology

3.1 Looking at Cells

Last class, we talked about the instrument that could observe small elements, like cells. These science instruments are called microscopes and there are various kinds of microscopes.  Our eyes have a form for the function to see what other humans are doing or feeling and we miss a huge amount of detail. One man found that if you curve glass, then it magnifies things and two of them together could make a compound microscope. The metric units. or SI. are km, m, cm, mm, µm, and nm. A millimeter is equaled to 10-3m and it is larger than micrometer, nanometer and angstrom. Millimeter –> micrometer  -> nanometer -> angstrom . And we are not able to see anything smaller than mycoplasma with the microscopes. Leeuwenhoek microscopes were made to see how hight the quality of the strings weaved together were and it had an magnification of 270 times.  A good microscope has a good resolution. “The resolving power is the ability to separate out objects that are close together.”

One type of common microscope is the light microscopes. It allows you to view living organisms but does not cost a lot and is very easy to transport. This microscope has a large field of view, it can magnify x2000 to the maximum and resolve to a minimum of 1nm.  Another common type of microscope is the electron microscope. The electron microscope uses electrons instead of light to magnify objects and the electrons wriggle through the light easily. They can only look at non-living organisms, cost highly and are very difficult to transport. “But they can magnify up to x200,000 and resolve to 1 nm.”  There are two types of electron microscopes: the Transmission Electron Microscope (TEM) and the Scanning Electron Microscope (SEM). The TEM slices and goes through specimen. On the other hand, the SEM gives a 3-dimensional view by rotating the specimen and it bounces off of the specimen, as well.

Dust mites are about 2oo micrometers. There are millions of them inside your bed and pillows. They feast on our dead skin cells and receive protein from them. Pollen are 20 micrometers and we usually breath them in. E coli lives in our intestines and rhinoviruses causes colds.

At the start of the lesson, we received this units question which was, ” How does form relate to function?” During the lesson, I found that the animal structure can deduce what it can do. For example, if you look at wet skinned frogs and their lungs, we can identify them to be able to go in and out of the water.  Also, we can identify a cheetah as a predator by looking at its big teeth and the speed at which they run at. All of these forms have functions.

The cell theory represents how all life is made up of one or more cells. Your not one thing, but you are a ‘communist organization’ with 10 trillion cells that work together to create and illusion of one thing. EVERYTHING that is living is made up of cells.

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One thought on “3.1 Looking at Cells

  1. Yurika,

    Excellent job of covering the main ideas in 3.1 and also some key points from the lecture. Also, good job of placing your response in the context of the unit essay question.

    Mr. F.

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