Prokaryotes
Presentation
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Biology
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7th - 8th Grade
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Medium
Standards-aligned
Annamaria Kocsis
Used 18+ times
FREE Resource
9 Slides • 16 Questions
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Prokaryotes
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The order of the levels of classification is:
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The two-name naming system used in modern classification of living organisms is called...
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Prokaryotes
Prokaryotes (or monera) are one of the simplest living things. They are small and single-celled. Bacteria are among the best-known prokaryotic organisms. Pro means before and kary means nucleus.They generally do not have a cell nucleus, nuclear membrane or cell organelles,
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Facts
Most of them can survive at very high or very low temperatures
Some of them can also survive in highly salty, acidic or alkaline water.
In general, biologists recognise 3 basic shapes of bacteria
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A typical bacterial cell
no nucleus
surrounded by a cell wall and a cell membrane
DNA is in the cytoplasm
can have flagella or cilia
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Reproduction
Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates).
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Types of Bacteria
Nitrogen - fixing
Parasites
Decomposer
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Diseases
Cholera, Leprosy
Tuberculosis
Salmonella
Pneumonia /Streptococcus/
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What is the shape of this bacteria?
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What is the shape of this bacteria?
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Viruses
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all types of life forms, from animals and plants to microorganisms, including bacteria. /bacteriophage!/
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Facts
Different viruses cause the common cold, influenza (flu), chicken pox, AIDS, and many other diseases.
On its own, a virus is lifeless.They are inactive when not inside a living cell, but are active when inside another living cell
Viruses are made up of genetic materials like DNA and are protected by a coating of protein.
They do not have an organized cell structure. They have no cell nucleus.
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Multiple Choice
Prokaryotes
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