9th Grade Biology-Chapter 7.1 Life is Cellular

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Generally larger and more complex than prokaryotic cells, contain dozens of structures and internal membrane and are highly specialized

Describe a eukaryote?

DO NOT have a nucleus, they carry out every activity associated with living things, they grow, reproduce, respond to the environment, always single called organisms

Describe a prokaryote?

Single- celled// multicellular

Eukaryotes can be ____________ (protists) or ____________ (animals and plants"

1. All living things are made up of cells. 2. Cells are the basic unit of structure and function in living things. 3. All cells come from preexisting cells through cell division.

What is the cell theory?

objective lens

What is the first lens?

Ocular lens

What is the second lens?

scanning electron microscope

What produces 3D images of a specimens surface?

Ultra thin slices

What specimen must be cut into so that the beam of electrons can pass through (appears 2-D)

ocular lens

Where is the blue arrow pointing?

objective lens

Where is the red arrow pointing

Makes it posible to explore cell structures and large protein molecules

What does a transmission electron microscope (TEM) do?

Plants, animals, protists

What is an example of a eukaryote?

By focusing light or electrons

How do most microscopes magnify the image of an object?

Bacteria

What is an example of a prokaryote?

Cells

What is the basic unit of life?

DNA, cytoplasm, and cell membranes

What do both types of cells contain?

They use chemical stains or dyes

What do scientists use to view cells?

It produces an enlarged image of something very small

What does a microscope do?

Beam of electrons is scanned over the surface of a specimen

What does a scanning electron microscope (SEM) do?

True/ false electron microscopes have a high resolution than light microscopes

True

True/ false most cells are nearly transparent

True

True

True/ false prokaryotic cells are generally smaller and simpler than eukaryotic cells

FALSE all parts of life are composed of cells

True/false only some parts of life are composed of cells

Cells that enclose their DNA in a nucleus

What are eukaryotes?

Cells that DO NOT enclose DNA in a nucleus

What are prokaryotes?

Prokaryotes and Eukaryotes

What are the two broad categories of cells?

transmission electron microscope (TEM) and Scanning Electron Microscope (SEM)

What are the two major types of electron microscopes?

To study cellular structures that are as small as 1 billionth of a meter in size

What can a electron microscope be used for?

Observed tiny living organisms in water using a microscope and he was the first one to use a microscope to study nature in the 1600's

What did Anton Van Leeuwenhoek do?

Concluded all plants are made of cells 1800s

What did Matthias Schleiden do?

Used light microscope to look at thin slices of plant tissue and say thousand of tiny chambers and called them cells

What did Robert Hooke do?

Concluded new cells can only be produced from the division of existing cells 1800s

What did Rudolf Virchow do?

Concluded all animals are made of cells in the 1800s

What did Theodor Schwann do?


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