Cells: from Earthlings to Martians

Topics: Bacteria, Cell, Cell nucleus Pages: 2 (703 words) Published: March 20, 2013
Daniel Petrov 8e Cells: From Earthlings to Martians? Mr F.Ade-Davis Science Our model of the cell developed from a lot of good scientists such as Robert Hooke and many others. Robert Hooke discovered cells when he looked at a slice of cork in a microscope. And he had also found out that it was made of many tiny cells. Furthermore, a Dutch scientist had discovered a large variety of red blood cells and sperm cells and egg cells. Cells are the basic building blocks of all living things. A cell is something really tiny that could not be seen with a naked eye but only using a microscope. They also take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary. Cells have many parts that each do a large variety of different things. Some of the things a cell contains is a cytoplasm and a nucleus. A cytoplasm is a jelly-like fluid that surrounds the nucleus and a nucleus controls the activities that the whole cell does. Cells also act together to form and create everything that exists in this world today. One type of cells are known as Bacteria cells. Bacteria were among the first life forms to appear on Earth, and are present in most habitats on the planet, growing in soil, water, acidic hot springs, radioactive wasteland and deep in the Earth's crust, as well as in organic matter and the live bodies of plants and animals. The vast majority of the bacteria in the body are rendered harmless by the protective effects of the immune system, and a few are beneficial. However, a few species of bacteria are pathogenic and could cause some serious infectious diseases, including cholera, syphilis, anthrax, leprosy, and bubonic plague. They contain a well developed cell structure. Bacterial cells are fairly small cells that come in many different types such as spheres, rods and spirals. Bacteria cells do not have a nucleus unlike early all of the other cells. They also contain a cell wall,...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • biology and cells Essay
  • Cells Essay
  • Cell Essay
  • Cells Essay
  • Essay about Cells
  • The Evolution of Eukaryotic Cells from Prokaryotic Cells Essay
  • Extraction of DNA from Cheek Cells Essay
  • Cell Cycle Essay

Become a StudyMode Member

Sign Up - It's Free