BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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by size, where they live, and whether they need air
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whether they have cell walls, flagella or cilia, and nuclei
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how they reproduce, where they get food, and whether they have DNA
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by shape, how they move and how they get energy
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Detailed explanation-1: -Also, they do not have many morphological features. Traditionally, the classification of prokaryotes was based on their shape, staining patterns, and biochemical or physiological differences.
Detailed explanation-2: -The characteristics of prokaryotic cells are: Membrane bound cell organelles such as Mitochondria, Golgi apparatus, Chloroplasts are absent. A membrane bound well defined nucleus is absent. Genetic material is circular DNA and occurs naked in the cell cytoplasm.
Detailed explanation-3: -There are three basic shapes of bacteria: coccus, bacillus, and spiral. Based on planes of division, the coccus shape can appear in several distinct arrangements: diplococcus, streptococcus, tetrad, sarcina, and staphylococcus. The bacillus shape can appear as a single bacillus, a streptobacillus, or a coccobacillus.
Detailed explanation-4: -They may get energy from light (photo) or chemical compounds (chemo). They may get carbon from carbon dioxide (autotroph) or other living things (heterotroph). Most prokaryotes are chemoheterotrophs. They depend on other organisms for both energy and carbon.
Detailed explanation-5: -Depending on the oxygen requirements, microorganisms can be classified as aerobic (requires O2), facultative (can grow in the presence or absence of O2), anaerobic (growth in the absence of O2), capnophilic ( CO2 stimulates growth), and microaerophilic (require slightly decreased O2 tension).