Lab Quiz 2 Flashcards
What are the two types of images?
Real and Virtual.
What is the type of microscope used in the lab?
Compound microscope.
What are the two lenses and where are they placed?
The ocular lens is the one next to the eye, while the objective lens is next to the object observed.
What is the name of the lenses which remain in focus when changing magnification?
Parfocal lenses.
What is the name of the lens placed underneath the object to focus the light on it?
The condenser lens.
What is the name of the aperture that can be adjusted to change the light shone onto the specimen?
The iris diaphragm.
What is the use of Methylene Blue?
This stains the DNA in the nucleus of the cell.
What is the name of the glass square placed on the microscope slide?
The cover slip.
What is the type of microscope that uses electron beams to magnify large molecules or viruses?
Scanning electron microscopes.
Why is the letter āeā upside down?
Because the object is beyond the focal point of the converging first lens. This inverts the image.
What is one ocular unit equal to in micrometers at 4x, 10x, 40x, and 100x.
4x: 25 micrometers
10x: 10 micrometers
40x: 2.5 micrometers
100x: 1 micrometer
What substance was added to the paramecium and euglena to slow down the cells?
Protoslo.
Are cell walls from adjacent cells connected or separate?
Separate.
What is the scientific name of the onion whose cell was observed?
Allium cepa.
What is the name of the leaf cell observed?
Elodea canadiensis.
What is the difference between a gram negative an gram positive bacterium?
Gram negative: stains pink with gram staining, has only a thin layer of peptidoglycan in its cell wall.
Gram positive: stains violet with gram staining due to the dye being embedded in its thick layer of peptidoglycan.
Which of the cells observed did not have a cell wall?
Euglena, paramecium, amoeba.
Which of the cells observed had a contractile vacuole?
Euglena, paramecium, amoeba.
Which of the cells observed were motile and how did they move?
The euglena moved with its flagellum.
The paramecium moved with its cilia.
The amoeba uses pseudopodia.
The E. Coli (bacterium) moved with its flagellum.
Which of the observed cells are autotrophic and which are heterotrophic?
Bacterium: heterotroph but can be autotroph (CO2).
Elodea canadiensis: autotroph.
Allium cepa: autotroph.
Paramecium: heterotroph.
Euglena: both.
Amoeba: heterotroph.
What are the components of an amoeba cell, what do they look like?
Food vacuole, (dark round shaped vacuole).
Contractile vacuole (clear round vacuole).
Pseudopod (outward extension of cell).
Ectoplasm (outer cytoplasm).
Endoplasm (inner cytoplasm).
Nucleus.
