Biology — Cell Biology & Microscopy
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/21
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai | Chat |
|---|
No analytics yet
Send a link to your students to track their progress
22 Terms
What is cell biology?
the study of the structure function and behaviour of cells
What has cell biology research helped develop?
breakthroughs like cancer treatments and vaccines
What units measure a cell's diameter?
micrometres (µm)
What units measure a cell's internal structures?
nanometres (nm)
Why do we need microscopes to see cells?
cells are far too small to see with the unaided eye
What is a micrograph?
an image captured through a microscope
How does a light microscope work?
it shines light through the specimen and lenses that bend the light to enlarge the image
How much can a light microscope magnify?
up to about 1000 times
Why are specimens often stained for light microscopy?
the dyes make cell parts visible
What is the key advantage of a light microscope?
it can view living cells
What living processes can a light microscope show?
things like cell division and the behaviour of microorganisms
What is a fluorescence microscope?
a type of light microscope that uses fluorescent dyes to make brightly coloured images
What is a fluorescence microscope used for?
to label and locate specific molecules or proteins in a cell
How does an electron microscope work?
it focuses beams of electrons on the specimen instead of light
What is the advantage of an electron microscope?
much greater magnification that reveals the structures inside cells
What is the main limitation of an electron microscope?
it can only view nonliving cells
What are the two types of electron microscope?
scanning (SEM) and transmission (TEM)
What does an SEM show?
a 3D image of a specimen's surface
What does a TEM show?
a thin slice revealing the internal structures of a cell
What is a memory aid for SEM and TEM?
SEM shows the Surface and TEM shows a slice Through the cell
What is the key difference between light and electron microscopes?
light microscopes view living cells at lower power while electron microscopes view only nonliving cells at much higher power
What is the difference between an SEM and a TEM?
an SEM shows the 3D surface while a TEM shows a thin internal slice