15 Questions
What is the primary characteristic used to distinguish living from non-living things?
Molecular movement
Which of the following statements is true about viruses?
Viruses do not show molecular movement until they infect a cell
Why is visible movement alone not a sufficient characteristic to define life?
All of the above
What is the primary reason for the controversy surrounding the classification of viruses as living beings?
Viruses do not show molecular movement until they infect a cell
Which of the following is NOT considered evidence for life?
A rock sitting still
In multi-cellular organisms, why is simple diffusion not sufficient to meet the requirements of all cells?
Cells are not in direct contact with the surrounding environment
What creates the need for a transportation system in multi-cellular organisms?
Specialized tissues taking up food and oxygen at one place
Why do multi-cellular organisms require a transportation system for food and oxygen?
Different body parts need these substances
What is the purpose of excretion in organisms?
To remove waste by-products created during energy generation
Why do multi-cellular organisms need to discard waste by-products outside the body?
By-products are not useful and can be harmful to cells
What is the main purpose of life processes?
To prevent damage and breakdown of the organism
Why is energy from outside sources necessary for organisms?
To power the life processes that maintain the organism
What is the primary reason for the need for additional raw materials from outside the organism?
To enable the organism to grow in body size
Why are oxidizing-reducing reactions commonly used by organisms?
To facilitate the breakdown of carbon-based molecules
What is the primary reason for the need for organisms to convert energy from food sources into a uniform source of energy?
To power the various molecular movements needed for maintaining living structures and growth
Test your knowledge on identifying living organisms based on their characteristics such as movement, respiration, and color. Explore how we differentiate between living beings and inanimate objects, including plants.
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