Microbiology: An Introduction, 11th Edition

Published by Benjamin Cummings
ISBN 10: 0321733606
ISBN 13: 978-0-32173-360-3

Chapter 1 - Figure 1.1 - Types of microrganisms - Question - Page 5: 1

Answer

Bacteria and archaea are prokaryotes. Bacteria can come in several shapes, but on a cellular basis a bacterium is a single-celled organism which is buffered by a cell wall composed of peptidoglycen. Archaea differs from bacteria in that if it has cell walls, it does not contain peptidoglycen. Fungi, protozoa, and algae are all eukaryotes. Fungi can be unicellular or multicellular, and all types of fungi possess cell walls composed of chitin. Fungi are incapable of photosynthesis. Protozoa are unicellular organisms which are mobile through the use of cilia, flagella, or pseudopods. Some protozoa are photosynthetic, some are not. Algae is usually unicellular, and has cell walls composed of cellulose. It is always photosynthetic. Viruses are sui generis: they are accelular microbes composed of one type of nucleic acid (either DNA or RNA), and are covered in a protein coat which is sometimes surrounded with a lipid membrane.

Work Step by Step

Bacteria and archaea are prokaryotes. Bacteria can come in several shapes, but on a cellular basis a bacterium is a single-celled organism which is buffered by a cell wall composed of peptidoglycen. Archaea differs from bacteria in that if it has cell walls, it does not contain peptidoglycen. Fungi, protozoa, and algae are all eukaryotes. Fungi can be unicellular or multicellular, and all types of fungi possess cell walls composed of chitin. Fungi are incapable of photosynthesis. Protozoa are unicellular organisms which are mobile through the use of cilia, flagella, or pseudopods. Some protozoa are photosynthetic, some are not. Algae is usually unicellular, and has cell walls composed of cellulose. It is always photosynthetic. Viruses are sui generis: they are accelular microbes composed of one type of nucleic acid (either DNA or RNA), and are covered in a protein coat which is sometimes surrounded with a lipid membrane.
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