BIO 181 Quiz #5 Flashcards
(31 cards)
What is the building blocks of all organisms?
Cells
Magnification….
process of enlarging an object in appearance
Resolution…
ability of a microscope to distinguish two adjacent structures as separate
The higher the resolution…
the better the clarity and detail of the image
Compound light microscopes
bend visible light to provide magnification
Transparent objects must…
be treated with chemical stains to distinguish different parts
Electron microscopes
achieve higher magnification and resolution using beams of electrons
Transmission electron microscopes
can show fine detail within cells
Scanning electron microscopes
provide 3D exterior views
Light or electron microscopes provides better image?
Electron
What is cell theory?
-Cells basic units of life
-All living organisms made of cells
-All cells come from preexisting cells
4 common cell components
plasma membrane, cytoplasm, DNA, ribosomes
Which is smaller: prokaryotic or eukaryotic?
Prokaryotic
Why prokaryotic is smaller?
-Surface area/volume ratio more favorable to move material in & out
-Lack internal transport aid modifications which eukaryotes have
Prokaryotes lack…
membrane-enclosed internal compartments
Most prokaryotes have cell walls containing…
Peptidoglycan
Which domains are prokaryotes?
Archaea & bacteria
Where is DNA in prokaryote?
In region called nucleoid
1500x
light microscope
2,000,000x
electron microscope
Two factors for faster diffusion?
Shorter distance and bigger surface area
Bacteria and archaea do NOT have…
nucleus
What is cell cremation?
Lose water & shrink
What is cell lysis?
Bigger & bigger until cell pops
