Module 1: Cells as the Basis of Life Flashcards
What sort of microscope can be used to view cells?
A light microscope
How it total magnification calculated?
Multiplying the magnification of the ocular lens by that of the objective lens.
What is resolution?
It indicates the minimum distance objects need to be apart to be able to be seen separately.
How do light microscopes work?
Pass light rays through thin specimens that are magnified by convex glass lenses.
What is fluorescent Microscopy?
Targets specific structures and uses labelling of the structures with fluorescent substances to see them.
How do electron microscopes work?
They use electron beams and electromagnets instead of light rays and lenses.
Now living specimens can be viewed with an electron microscope.
How do transmission electron microscopes work?
Beams of electrons pass through a specimen and produce a two-dimensional image.
How do scanning electron microscopes work?
Electron beams bounce off surfaces and create a 3-dimensional image.
What are confocal laser scanning microscopes and what do they do?
An optical imaging technique which pinpoints laser beams to make images of many layers, which are then combined into a 3-dimensional model.
what is the function of membranes?
They are selectively permeable boundaries and control the movement of substances into and out of the cell/organelle.
what is the function of protoplasm?
The living content of a cell that is surrounded by a cell membrane.
what is the function of the nucleus?
It is the control and information centre.
