9th Grade Biology-Chapter 7.1 Life is Cellular
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?
