Cells and DNA

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Animal and Plant Cells

Plant and Animal cells have similarities and differences:

Animal Cell;

  • Nucleous- contains DNA that controls what the cell does.
  • Cytoplasmn- gel like substance where most of the chemical reactions happen.
  • Cell Membrane- holds the cell together and controls what goes in and out.
  • Mitochondriia- these are where most of the reacts for respiration happen. Respiration releases energy that the cell needs to work.

Plant Cell;

  • Rigid Cell Wall- ade of cellulose gives support for the cell.
  • Largre Vacuole- contains cell sap a weak solution of sugar and salts.
  • Chloroplasts- where photosynthesis occurs. They contain a green substance called chlorophyll.
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Bacterial Cells and Microscopes

Bacterial cells have no necluous and Cells are studied using Microscopes;

Bacterial Cell;

  • Chromosomal DNA is one long circular chromosome that controls the cells activities and replication. It floats free in the cytoplasmn.
  • Plasmids are small hoops of extra DNA that aren't part of the chromosome. Plasmids contain genes for things like drug resistance it cane be passed between bacteria.
  • The Flagellum is a long hair like structure that rotates to make the bacterium move.
  • The Cell Wall supports the cell.

The Microscope;

  • Calculate Magnification- lenghth of image divided by lenght of specimen.
  • Step 1- look through the eyepiece.
  • Step 2- focus the micrscope then finally tune the focus.
  • Step 3 and 4- Select the lowest poweered objective lens, then choose a higher magnifiation if needed. Then place the specimen onto the stage.
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