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September 26, 2013 The Living Body and Life.docx

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Natural Science
NATS 1610
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The living Body and life Thursday September 26, 2013 -Definition of Life: The condition that distinguishes organisms from inorganic objects and dead organisms. Being manifested by growth through metabolism, reproduction the power to adapt to the environment through changes originating internally Or The sum of the distinguishing phenomena of organisms, especially metabolism, growth, reproduction, and adaption to environment. -in biology, an entity is generally considered to be alive if it exhibits all the following phenomena at least once during its existence • Order and organization, Acquiring and using energy, Metabolism, Regulation, Sensing and responding to stimuli, Cells, Motion, Growth and Reproduction, Ability to evolve -living organisms contain molecular components such as: carbs, lipids, nucleic acids and proteins -Are Viruses alive? • They are inert mixtures of protein and genetic material o RNA protects the genetic material o Some have a protein coat to protect the DNA inside (adenovirus – cold) o Most viruses follow similar shapes, cylinder, sphere, or geometric shape, but some can have a weird shape with a head, body and legs (like an “alien”) -Viruses increase their numbers and evolve into new forms-by using host cells “to do all the work” -When inside a host cell (an infected cell) • Viral genetic material (nucleic acid) is released from virus • Host cell processes the viral genetic material • Producing
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