Biology. basic concepts (cells).

Páginas: 3 (561 palabras) Publicado: 12 de septiembre de 2010

Life Is Cellular

1. Who discovered cells?
A. Robert Hooke.

2. Who used the microscope to observe tiny living organisms in drops of pond water?
A. Anton van Leeuwenhoek.

3. Whatare cells?
A. Are the basic units of life.

4. Concluded that all plants were made of cells.
A. Matthias Schleiden.

5. Stated that all animals were made of cells.
A. Theodor Schwann.

6.Concluded that new cells could be produced only from the division of existing cells.
A. Rudolf Virchow.

7. The cell theory states:
A. All living things are composed of cells.
Cells are thebasic units of structure and function in living things.
New cells are produced from existing cells.

8. Proposes the idea that certain organelles, tiny structures within some cells, were oncefree-living cells themselves.
A. Lynn Margulis.

9. What is a scanning probe microscope?
A. Microscope that scans a tiny probe just above the surface of a sample and produces an image by recordingthe position of the probe.

10. What are a confocal light microscopes?
A. Microscopes that construct images by scanning cells with a computer-controlled laser beam.

11. What are a scanningelectron microscopes?
A. Microscopes that produce three-dimensional images of the surfaces of cells.

12. What is nucleus?
A. Is a large membrane-enclosed structure that contains the cell’s geneticmaterial in the form of DNA.
13. What is a membrane?
A. Is a thin layer of material that serves as a covering or lining.

14. Are cells that contain nuclei?
A. Eukaryotes cells.

15. Are cellsthat do not contain nuclei?
A. Prokaryotes cells.

Eukaryotic Cell Structure

1. What are organelles?
A. Are structures in the cell that act as if the are specialized organs.

2. Is theportion of the cell outside the nucleus?
A. Cytoplasm.

3. Is composed of two membranes, is dotted with thousands of nuclear pores, which allow material to move into and out the nucleus.
A. Nuclear...
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