Biology Notes.docx - Biology Notes Organism share common...

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Biology Notes: Organism- share common characteristics Acquire and use materials and energy Cell- basic unit of life Separated from surroundings by membrane Unicellular- One cell Multicellular- Multiple cells Important materials are acquired through water, air, soil, & bodies of other living things Know difference- Herbivore- animal that feeds plants Carnivore- animal that feeds on flesh Omnivore- animal or person that eats both plants and animals Organisms actively maintain organized complexity Living things continuously use energy to maintain themselves sensory organs in animals can detect and respond to internal stimuli such as light sound and chemicals internal stimuli in animals are perceived by stretch interpretation Growth: every organism becomes larger over time plants and animals grow by producing more cells to increase their mass bacteria grow by enlarging their cells Organisms reproduce: Organisms reproduce by dividing in half, producing seeds, laying eggs DNA- reproduction Evolution (Charles Darwin) -Changes in DNA within a population over generations Chimps & Humans -anatomy
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-physiology -DNA -embryology -behavior -DNA of humans differs from chimp by less than 5% Mutation - occur when changes in genes are mistakenly copied Inheritance Natural Selection- survival of fittest - Certain inheriting trait takes over (better trait that fits in environment better) Genetic variation- difference in genes Adaptation- structures, processes, or behaviors that aid in survival in an environment Pairs of genes: A-T C-G Some Mutations are Inherited Occurs in parent sperm or egg Passed onto offspring cell Effects of mutation- Neutral No effect or harmless common Disadvantages Death or poor reproductive success Advantageous
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  • Spring '10
  • Crousillac
  • Plant Cell,  Organism

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