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Title: A2 Level (Unit 4) Bacteria and Virus Cell Question and Answers
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Bacteria and Virus Cell Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Bacteria and Virus Cell Really easy, fast and effective revision resource. Questions and Answers!
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Unit 4 – The Natural Environment and Species Survival
BACTERIA CELLS
What is a bacterium?
-It is a prokaryotic cell
What components are present in bacteria?
-Capsule
-Cell wall
-Cell surface membrane
-Ribosomes
-Mesosome
-Pilus
-Plasmids
-Main circular DNA
-Flagellum
What are the functions of each of these components?
-Capsule – the mucus layer for protection and prevent dehydration
...
-Ribosomes – site of protein synthesis, occurring freely in cytoplasm
...
-Pilus – Protein tubes that allow bacteria to attach to surfaces
-Plasmids – Small circles of DNA
-Flagellum – Used for cell movement
VIRUS CELL
What is the basic structure of the virus cell?
-Protein coat
-Nucleic acid (DNAA or RNA)
Why do some viruses have an outer envelope and what do they contain?
-The envelope may be taken from the host cell’s surface membrane
...
-They also have glycoproteins from the virus itself known as antigens
...
What are examples of disease caused by viruses?
-Flu, measles, chicken pox, cold sores
Title: A2 Level (Unit 4) Bacteria and Virus Cell Question and Answers
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Bacteria and Virus Cell Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Bacteria and Virus Cell Really easy, fast and effective revision resource. Questions and Answers!