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bio lab quiz 3
26 cards·by jttibbs1
What year was the microscope invented?
1590
Who invented the microscope?
Hans and Zaccharias Janssen
What are the two types of microscopes?
Compound and dissecting.
What are compound microscopes used for examining?
Thin specimens
What are dissecting microscopes used for?
Thick specimens.
Define magnification.
The enlargement of an image.
Define resolution.
The ability to distinguish between two separate points of an image.
Define contrast.
The degree to which an image stands out against its background.
What is the correct way to carry a microscope?
Hand on base and hand on arm
Define total magnification.
Number of times a specimen's actual size is enlarged.
Define field of view
circle of light seen when looking through ocular lens.
Define working distance
distance between end of each objective lens and the stage
What is the basic unit of life?
Cells
All living organisms are composed of...
One or more cells.
What are the smallest living things?
Cells
Where do all cells come from?
Preexisting cells
What is a cell?
A highly organized structure that consists of a cell membrane with cytoplasm and dna inside
Who discovered cells?
Robert Hooke
When were cells discovered?
1665
Cells were first observed in ____ and appeared to be ___ ___.
cork, small boxes
Name the two types of cells and give characteristics.
Prokaryotes and eukaryotes.
What are the three shapes of bacteria
Round, rod, and spiral
What bacteria is round?
Coccus
What bacteria is shaped like a rod?
Bacillus
What bacteria is shaped like a spiral?
Spirilla
Differences between plant and animal cells.
Animals have no cell wall or chloroplasts. Plants are rigid, animals are loose.