Under a microscope, you probably noticed that all of the onions cells were roughly the same shape whereas the squamous cells from your buccal cavity, while roundish, may have been folded or bent. What do you think keeps all of the plant cells the same shape? A) Vaucole B) Cell membrane C) Chloroplasts D) Cell wall
Microscopic examination
The analysis of minute organisms, cellular organization of any biological structure, and composition of body fluids with the help of a microscope is known as microscopic examination. The magnification of specimens or samples under study helps in attaining a clearer picture of it.
Gram Staining
Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.
1. Under a microscope, you probably noticed that all of the onions cells were roughly the same shape whereas the squamous cells from your buccal cavity, while roundish, may have been folded or bent. What do you think keeps all of the plant cells the same shape?
A) Vaucole
B) Cell membrane
C) Chloroplasts
D) Cell wall
2. When stained with methylene blue (buccal cell) and haemalum acid (onion cell), the nuclei were the only cellular structures that stained. This has to do with the stains being cationic (positively charged). What charge do you think the nuclei are in order to be stained?
A) Positive (cationic)
B) Negative (anionic)
C) Neutral
D) Hypotonic
3. FILL IN THE BLACKS USING THE BOLDED BRACKET OPTIONS:
Observable physical differences between the three types of simple epithelial tissue are that squamous epithelial cells are _________ (flat, equal, more, less, cube, column, buccal, wider), whereas cuboidal epithelial cells have _____ (flat, equal, more, less, cube, column, buccal, wider) height and width and columnar epithelial cells have _______ (flat, equal, more, less, cube, column, buccal, wider) height than width.
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