1 Flashcards
(16 cards)
What is the magnification capability of school microscopes?
Several hundred times
School microscopes are affordable and can be used anywhere, making them accessible for observing live specimens.
What is the maximum magnification of electron microscopes?
Around 2000000 times
Electron microscopes are very expensive and require specific environmental conditions.
What type of electron microscope has very high magnification and resolution?
Transmission electron microscopes
These microscopes provide detailed images due to their high resolving power.
Define magnification in the context of microscopy.
Size of image compared to size of real object.
What is resolution in microscopy?
Ability to distinguish between two separate points
The resolving power of a microscope affects the detail it can show.
What is the maximum resolving power of light microscopes?
About 200 nm.
What is the maximum resolving power of electron microscopes?
0.2 nm.
What is the function of the nucleus in a cell?
Controls all the activities of the cell
It is surrounded by the nuclear membrane and contains genes on chromosomes.
What is cytoplasm?
Liquid gel in which organelles are suspended
Most chemical reactions needed for life take place in the cytoplasm.
What is the role of the cell membrane?
Controls the passage of substances into and out of the cell.
What process takes place in mitochondria?
Aerobic respiration
This process releases energy for the cell.
Where does protein synthesis occur in cells?
Ribosomes.
How do plants make their own food?
By photosynthesis.
How do plant cells compare in size to animal cells?
Plant cells are often bigger than animal cells.
What are algae classified as?
Protista
Algae are simple organisms that make their own food by photosynthesis and were historically considered plants.
What material is found in the cell walls of plants and algae?
Cellulose
This provides strength and support to the cell.
