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Questions and Answers
Which of the following is a key characteristic of life?
Which of the following is a key characteristic of life?
- Inability to respond to stimuli
- Absence of biological processes
- Capacity for homeostasis (correct)
- Lack of reproduction
What makes the definition of viruses challenging?
What makes the definition of viruses challenging?
- They can only replicate in host cells (correct)
- They exhibit growth and adaptation
- They exist in air, water, and soil
- They have self-sustaining processes
Where does life exist on Earth?
Where does life exist on Earth?
- Only in air
- In air, water, and soil (correct)
- Only in water
- Only in soil
When did life originate?
When did life originate?
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What did Empedocles propose about the composition of life?
What did Empedocles propose about the composition of life?
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Study Notes
Key Characteristics of Life
- Organization: having cells as the basic unit of life
- Metabolism: ability to carry out chemical reactions to maintain internal environment
- Homeostasis: ability to maintain a stable internal environment despite external changes
- Growth and Development: ability to grow, reproduce, and respond to stimuli
- Reproduction: ability to produce offspring
- Response to Stimuli: ability to react to internal and external stimuli
- Evolution: ability to adapt and change over time
Definition of Viruses
- Viruses are challenging to define because they do not meet all the key characteristics of life
- Viruses do not have cells, do not carry out metabolic processes, and do not respond to stimuli on their own
- Viruses require a host cell to replicate and exhibit characteristics of life
Life on Earth
- Life exists almost everywhere on Earth, from the surface to deep-sea vents
- Extreme environments such as hot springs, Antarctic ice sheets, and deep-sea trenches support life
Origin of Life
- The exact timing of life's origin on Earth is unknown, but it is believed to have occurred at least 3.5 billion years ago
- The earliest evidence of life on Earth dates back to around 3.4 billion years ago
Empedocles' Proposal
- Empedocles proposed that life is composed of four elements: earth, air, fire, and water
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