By Sherman Hollar
Describes the actual features of bactera, algae and protozoa, and some of the clinical and commercial makes use of of bacteria.
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Extra info for A closer look at bacteria, algae, and protozoa
The majority of red algae live in tropical marine habitats, and most species are multicellular. Red algae have a complex life history, which means they go through several stages of development as independent organisms in order to complete their life cycle. Most undergo sexual reproduction. Like many algae, rhodophytes contain chlorophyll and thus are able to photosynthesize their own food. Red algae also contain the reddish pigment phycoerythrin, which confers on them their characteristic color.
Autotrophic bacteria can grow on powdered Bacteria that produce color include Pseudomonas aeruginosa, from sputum. W. Rakosy/EB Inc. 40 the ImPortAnce, dAngers, And uses of BActerIA sulfur and other inorganic substances and get carbon from carbon dioxide in the air. Sugars, amino acids, and vitamins are used for some heterotrophs. Blood may be added to cultures used to grow some pathogenic species. The identification of bacteria can be difficult and traditionally requires application of numerous Bacteria that produce color include Serratia marcescens, from a dirty utensil.
Most of the weeds are S. natans, a free-floating species, but many other species of Sargassum grow attached to rocks along coasts. S. natans, which is kept afloat by its small but prominent berrylike air bladders, travels with the wind and current. It supports a specialized marine life and provides for seabirds a resting place in the middle of the ocean. An inch-long baby flying fish swims in berried branches of sargassum, Sargasso Sea, Atlantic Ocean. Paul Zahl/ National Geographic Image Collection/Getty Images 57 A closer look At BActerIA, AlgAe, And ProtozoA Chlorophyta: The Green Algae There are approximately 6,000–8,000 species in this group, 10 percent of which are marine.