Ch. 3 Cell Organization. Cells and Tissues Carry out all ___________________ needed to sustain life…
What are the requirements of life?. Nutrient and energy source Water Physical conditions which can...
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Transcript of What are the requirements of life?. Nutrient and energy source Water Physical conditions which can...
![Page 1: What are the requirements of life?. Nutrient and energy source Water Physical conditions which can sustain life.](https://reader035.fdocuments.us/reader035/viewer/2022062805/5697bfc81a28abf838ca84db/html5/thumbnails/1.jpg)
What are the requirements of life?
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What are the requirements of life?
Nutrient and
energy source
WaterPhysical conditions which can sustain life
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I. IntroductionA. How do we tell what life is? 1. Dictionary a. “the quality that distinguishes a vital functioning
being from a dead body”
b. but what is that “quality”
What Is Life?
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2. Intuitive knowledge
a. living things have complexity and ordered interaction among those complex parts
b. much more difficult to describe or define life
c. develop criteria for identifying life
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B. Characteristics of life 1. Orderly structure or organization a. complex structure b. organic (carbon-based) molecules
A
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2. Acquire and use materials/energy
a. maintain complexity b. maintain organization c. require energy - directly
i. photosynthesis - indirectly
i. energy stored in materials
C
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3. Maintain Internal Environment - Homeostasis a. organisms keep conditions in their bodies fairly constant to live b. metabolism in organisms is almost always constant c. conditions include temperature, water levels, salt levels
A
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4. Change during Lifetime a. development occurs during organisms lifetime - organized, replicated pattern of changes b. Growth - at sometime in lifecycle, all organisms become larger - conversion of acquired materials for increased size
D
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5. Reproduction a. Living things reproduce themselves b. Transmittal of genetic material (e.g. DNA) to new generation
C
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6. Respond to stimuli & Adjust to surroundings a. react to physical or chemical changes in their environment b. short term response - within single lifetime
7. Populations are modified & adapt to environment a. long-term response - requires multiple generations
(usually many generations) b. requires modification
due to genetic mutations c. Adaptation
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Does it:1) have orderly structure?2) consume energy?3) maintain internal environment?4) develop or grow?5) reproduce passing on heritable traits?6) respond to stimuli7) as a population, evolve to better “fit” the environment?
IS IT ALIVE?
Criteria for life