Life Science

• Adaptation


  Ability of biological beings to adjust to their environment in order to survive
• Natural selection


  Individuals with beneficial variations may live longer and produce more offspring than those that don't
• Descent with modification


  As traits are passed through generations, there is modification
• Response


  Reaction to stimulus
• Stimulus


  Any condition in the environment that requires an organism to adjust
• Homeostasis


  Regulation of internal conditions
• System


  A complex organization formed from a combination of smaller parts
• All living things are organized into cells and made of same organized matter
• Specialized


  Adapted for a particular function
• Levels of organization


  1. Cell

  2. Tissue

  3. Organ

  4. Organ system

  5. Organism
• Metabolism


  The chemical process by which a plant or an animal uses food, water, etc., to grow and heal and to make energy
• Reproduction


  Organisms reproduce their own kind
• Genes


  Units of genetic information responsible for family inheritance and it is made of DNA
• DNA


  Genetic material that enables organisms to reproduce their own kind
• Ecology


  Factors that determine interdependence, survival and growth of an organism in an environment
• Abiotic factors


  Non-living components of an environment
• Biotic factors


  Living components of an environment
• Special creation


  Life form may have been put on earth by supernatural or divine forces
• Extraterrestrial origin


  Life may not have originated on earth at all, instead, life may have infected earth from some other planet
• Spontaneous origin


  Living organism can originate from inanimate object
• Protobionts


  Chemical process leading to the evolution of life took place with bubble on the ocean surface
• Microfossils


  Single celled, lack appendages and had little evidence of internal structure, resemble present day bacteria or prokaryotes
• Types of bacteria


  • Archaea
  • Eubacteria
• Evolution


  generation-to-generation change in the proportion of different inherited genes in a population
• Categories of living things according to food source:

  Autotrophic – an organism that uses energy from the sun for photosynthesis to make its own food .

  Heterotrophic – an organism that ingests food to receive energy.
• 
  

  Each cell contains copy of ALL DNA in your genomeu

  Inherited info in the form of DNA enables organisms to reproduce their own kindu

  Growth and development.
• Genes


  u(units of genetic information) are responsible for family inheritance
• THE BUBBLE THEORY

              (Alexander Oparin)

  “Primary abiogenesis”

  He suggested that the present day atmosphere was incompatible with the creation of life.

  Protobionts

      (Louis Lerman) proposed that the chemical process leading to the evolution of life took place with bubble on the ocean surface.