Chapter 3A Flashcards
What are the 3 components of the cell theory?
1) cells are the fundamental unit of life
2) All organisms contain one or more cells
3) Cells come from preexisting cells.
What is the difference between magnification and resolution?
Magnification is the ability to make something bigger and Resolution is the measure of clarity.
What total magnification can (generally) be obtained using a light microscope?
x1000
What total magnification can (generally) be obtained using an electron microscope
x100000
What are the smallest objects observable using both types of microscopes
organelles and small molecules
What is the difference between scanning
and transmission electron microscopes?
(TEM) uses a beam of electrons like a beam of light to form an image (high resolution)
(SEM) the electrons interact with the sample and X-rays emitted from the sample are studied. (low resolution)
What are the 4 features shared by all cells
- Cell membrane or the plasma membrane
- cytosol
- dna/rna
- Ribosomes
Why are most cells small
They have to be
why is the surface area so important to volume ratio
cells have to be efficient in getting things in and out.
how many cell types are there
2: prokaryotes and eukaryotes
what are the 4 primary differences between prokaryotes and eukaryotes
Prokaryotes: Have no nucleus, no organelles, are smaller, basic
Eukaryotes: Has a nucleus, has organelles, bigger, more complex
How many domains are there?
3: Bacteria, Archaea, and Eukarya
what are two characteristics of Bacteria
- prokaryotic
- Single/unicellular
what are two characteristics of Archaea
- prokaryotic
- Single/unicellular
what are two characteristics of Eukarya
- Eukaryotic
- multicellular
