Ck12 reading microscopes

Which two Dutch spectacle makers,were experimenting with several lenses in a tube. Zacharias Janssen and his son Hans,discovered that nearby objects appeared greatly enlarged, or magnified.

• Robert Hook and his son Hans

• James Hook and Morris Hook

• Zacharias Janssen and his son Hans,

In 1665, , an English natural scientist, used a microscope to zoom in on a piece of cork. He saw tiny boxes. cRobert Hook called them cells

• Han Janssen

• Zacharias Janssen

• Robert Hook

It turns out that cells are the _______________ structural unit of living organisms.

• Hugest

• unnecessary

• smallest

All living things are made of cells

• False

• True

Dutch scientist taught himself to make one of the first microscopes.

• Antonie van Leeuwenhoek

• Robert Hook

• Han Janessen

Antonie van Leeuwenhoek took a sample of scum from his own teeth and used his microscope to discover bacteria, the smallest living organism on the planet. Using microscopes, van Leeuwenhoek also discovered one-celled protists and sperm cells.

• Zacharias Janssen

• Robert Hook

• Antonie van Leeuwenhoek

A microscope is a tool used to make things that are too small to be seen by the human eye look bigger

• True

• False

Uses lenses, typically made of glass or plastic, to focus light either into the eye, a camera, or some other light detector. The most powerful _____________microscopes can make images up to 2,000 times larger.

• Scanning electron microscopes (SEM)

• Transmission electron microscopes

• Light microscopes

This microscope focus a beam of electrons through an object and can make an image up to two million times bigger, with a very clear image.

• Scanning acoustic microscopes

• Transmission electron microscopes (TEM)

• Scanning electron microscopes (SEM)

These microscopes slide a beam of electrons across the surface of a specimen, producing detailed maps of the surface of objects. Magnification in a SEM can be controlled over a range from about 10 to 500,000 times.

• Light microscopes

• Scanning electron microscopes (SEM)

• Scanning acoustic microscopes