Which of the following is not part of the early cell theory? A)All organisms are multicellular. B)All organisms are made of one or more cells. C)The cell is the fundamental unit of life. D)All cells come from preexisting cells. 2) Which of the following features is not common to all cells? A)cell wall B)ribosomes C)RNA and DNA D)cytoplasm 3) Which of the following does not describe an organism in the domain bacteria? A)Has a typical cell size of 10-100 micrometers. B)Is considered a prokaryote. C)Can use a flagella to swim in fluids. D)Contains a nucleod region.
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.
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