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21.1 The Viruses
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- Viruses are noncellular, while prokaryotes are fully functioning cellular organisms.
- All viruses have an outer capsid composed of protein and an inner core of nucleic acid. Some have an outer membranous envelope.
- Viruses are obligate intracellular parasites and they reproduce inside bacteria, plant cells, and animal cells.
| - True or False: Viruses are the smallest known cells.
Answer - What makes up the outer capsid and inner core of viruses?
Answer - What characters are used to classify viruses?
Answer - Explain the general way in which viruses reproduce.
Answer
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Summaries of major points:- Viruses are nonliving with varied appearance
- Viral structure
- Parasitic nature
- Viral replication
- Replication of bacteriophages
- Replication of animal viruses
- Viral infections
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21.2 The Prokaryotes
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- Prokaryotes, the archaea and bacteria, lack a nucleus and most other cytoplasmic organelles found in eukaryotic cells.
- Prokaryotes reproduce asexually by binary fission. Mutations introduce variations, but genetic recombinations occur among bacteria.
- Some prokaryotes require oxygen; others are obligate anaerobes or facultative anaerobes.
- Some prokaryotes are autotrophs, being either photoautotrophs or chemoautotrophs.
- Most prokaryotes are chemoheterotrophs. Many chemoheterotrophs are symbiotic, being mutualistic, communalistic, or parasitic.
| - How is the DNA of prokaryotes organized?
Answer - Prokaryotes reproduce asexually by means of ______________.
Answer - What are three ways prokaryotes can experience genetic recombination and how does each work?
Answer - What is the difference between photoautotrophs and chemoautotrophs?
Answer
| Summaries of major points:- Prokaryotes include the bacteria and archaea
- Structure of prokaryotes
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21.3 The Bacteria
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- Gram staining, shape of cell, type of nutrition, and other biochemical characteristics are used to differentiate groups of bacteria.
| - What unique molecule can be used to identify bacteria and where is it found?
Answer - What structure is currently used to classify bacteria?
Answer - What type of bacterial cell is able to photosynthesize?
Answer - What are heterocysts, what happens there, and in what type of bacteria are they found?
Answer
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Summaries of major points:- Gram stain and shape
- Types of bacteria
- Cyanobacteria
- Reproduction
- Endospore formation
- Nutrition
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21.4 The Archaea
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- The Archaea have biochemical characteristics that distinguish them from the bacteria.
- The Archaea are quite specialized and live in extreme habitats.
| - To which are the Archaea more closely related, Bacteria or Eukarya, and how are they similar?
Answer - What is classification of Archaea currently based on, what are three types, and where are they found?
Answer
| Summaries of major points:- Archaea are prokaryotes
- Structure and function
- Types of Archaea
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