biology cell life

What is the cell theory?

All living things are made of cells; cells are the basic units of structure and function in living things; new cells are produced from existing cells.

Who named the empty chambers he observed in cork 'cells'?

Robert Hooke

Who was the first to observe living microorganisms?

Anton van Leeuwenhoek

What are the two basic categories of cells?

Prokaryotes and Eukaryotes.

What distinguishes prokaryotic cells from eukaryotic cells?

Prokaryotic cells do not enclose their DNA in nuclei, while eukaryotic cells do.

What type of microscope uses lenses that focus light?

Compound light microscope.

How much can a compound light microscope magnify objects?

Up to 1000 times.

What do electron microscopes use to achieve higher resolution?

Beams of electrons focused by magnetic fields.

What are the two main types of electron microscopes?

Transmission electron microscopes and scanning electron microscopes.

What type of image does a transmission electron microscope produce?

A 2D image of the inside of a specimen.

What type of image does a scanning electron microscope produce?

A 3D image of the surface of a specimen.

What is the size range of prokaryotic cells?

1-5 μm.

What is the size range of eukaryotic cells?

10-100 μm.

Which category of cells is your body composed of?

Eukaryotic cells.

Who concluded that all plants are made of cells?

Matthias Schleiden.

Who concluded that all animals are made of cells?

Theodor Schwann.

Who stated that new cells are produced from existing cells?

Rudolph Virchow.

What is the basic structural and functional unit of all living things?

The cell.

What is one advantage of using a compound light microscope over electron microscopes?

It can see living things.

What is a similarity between light microscopes and electron microscopes?

Both magnify images so they can be seen with the naked eye.

What is a difference between scanning and transmission electron microscopes?

Scanning produces a 3D image of the surface, while transmission produces a 2D image of the insides.

Why is the cell theory considered a scientific theory?

Because it has been tested many times by many scientists and the results have continuously been supported.