The image shows one of the four major groups of microorganisms.  Identify the group and its key feature.
AFungi — multicellular, with hyphae
BAlgae — autotrophic and chlorophyll-containing
CViruses — non-cellular, only reproduce inside a host
DBacteria — single-celled organisms, the most numerous microbes on Earth
Answer & Solution
Correct answer: D. Bacteria — single-celled organisms, the most numerous microbes on Earth
Fig. 2.1 shows bacteria — typically single-celled, with a variety of shapes (rods, cocci, spirilla). Bacteria are the most numerous microbes; some are useful (Rhizobium, Lactobacillus) and some are pathogens (cholera, tuberculosis).
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