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General Biology: Introduction to Life on Earth

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Termini in questo insieme (20)

  • What are the six common characteristics that define life?
    Acquire and use materials and energy, actively maintain organized complexity, sense and respond to stimuli, grow, reproduce, and evolve collectively.
  • What is the basic unit of life?
    The cell, which is separated from its surroundings by a membrane and contains various structures and chemicals in a fluid environment.
  • What distinguishes unicellular from multicellular organisms?
    Unicellular organisms consist of a single cell, while multicellular organisms consist of two or more cells.
  • How do organisms acquire energy?
    Organisms obtain energy through photosynthesis (autotrophic) or consumption (heterotrophic). All life energy comes directly or indirectly from the sun.
  • What does it mean that organisms maintain organized complexity?
    Living things use energy to maintain internal order and homeostasis, such as regulating body temperature and chemical balance.
  • What is homeostasis?
    The maintenance of relatively constant internal conditions like body temperature, blood pH, and water levels.
  • How do organisms sense and respond to stimuli?
    Organisms detect external and internal stimuli through sensory organs or receptors and respond accordingly.
  • How do plants, fungi, and bacteria respond to stimuli?
    They respond to environmental changes such as light, chemicals, and temperature, similar to animals.
  • How do organisms grow?
    Growth involves increasing size by producing more cells (plants and animals) or enlarging cells before division (bacteria).
  • How do organisms reproduce?
    Organisms reproduce by cell division, producing seeds, live young, or eggs, passing DNA to offspring.
  • What is evolution in biological terms?
    Evolution is the change in DNA within a population over generations, leading to modifications in organisms.
  • What is a population in biology?
    A group of the same type of organism living in the same area.
  • What is the role of DNA in living organisms?
    DNA carries genetic information passed from parents to offspring, guiding growth, reproduction, and function.
  • Why is energy essential for life?
    Energy is required to maintain organization, perform chemical reactions, grow, and reproduce.
  • What is the difference between autotrophic and heterotrophic organisms?
    Autotrophs make their own food via photosynthesis; heterotrophs consume others for energy.
  • What happens if energy is not used to maintain organization in living things?
    Organization tends to disintegrate, leading to loss of life functions.
  • What is the significance of the cell membrane?
    It separates the cell from its environment and controls the movement of substances in and out.
  • How do cells maintain chemical reactions necessary for life?
    By pumping chemicals in and out to create suitable internal conditions.
  • What is the relationship between photosynthesis and energy flow in ecosystems?
    Photosynthesis traps solar energy, which is then transferred through food chains sustaining ecosystems.
  • How does the scientific method relate to biology?
    It is a systematic approach to inquiry used to investigate biological questions and problems.