Virus Structure Division II MST 20062007

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Virus StructureDivision II MST2006-2007
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Various Virus Structures
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Various Virus Structures
Bacteriophage
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Various Virus Structures
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Various Virus Structures
Human Immunodeficiency Virus -a type of
retrovirus-
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What are the characteristics of living organisms?

• Are both complex and organized (cells)

• Acquire and use materials and energy (nutrition
  and metabolism).

• Exhibit some capacity to regulate their internal
  conditions (homeostasis)

• Show the capacity for growth

• Respond to stimuli

• Reproduce themselves

• Have the capacity to evolve

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So what is your definition of life?
Are viruses alive?