Podcast
Questions and Answers
Which characteristic is essential for all organisms?
Which characteristic is essential for all organisms?
- They can exist independently of cells.
- They can respond to their surroundings. (correct)
- They require sunlight to survive.
- They can reproduce only sexually.
What role do nucleic acids play in living organisms?
What role do nucleic acids play in living organisms?
- They act as the primary energy source for cells.
- They guide cellular functions through chemical instructions. (correct)
- They provide structural support to cells.
- They facilitate the reproduction of viruses.
What distinguishes unicellular organisms from multicellular organisms?
What distinguishes unicellular organisms from multicellular organisms?
- Unicellular organisms perform all life functions within one cell. (correct)
- Unicellular organisms lack cellular organization.
- Multicellular organisms consist of one cell.
- Multicellular organisms can survive independently of each other.
In which form of reproduction do two parents combine their DNA?
In which form of reproduction do two parents combine their DNA?
What is the primary function of carbohydrates in cells?
What is the primary function of carbohydrates in cells?
What process do producers primarily use to obtain energy from sunlight?
What process do producers primarily use to obtain energy from sunlight?
What term describes organisms that consume food for energy and cannot make their own food?
What term describes organisms that consume food for energy and cannot make their own food?
Why is water essential for all living things?
Why is water essential for all living things?
What is the main concept of homeostasis in living organisms?
What is the main concept of homeostasis in living organisms?
What can happen to some organisms if they do not have access to water?
What can happen to some organisms if they do not have access to water?
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Study Notes
Characteristics of Living Things
- Organism: any living thing.
- Cells: All organisms are made up of cells.
- Chemicals: All organisms contain similar chemicals and use energy.
- Response: All organisms respond to their surroundings.
- Growth & Development: All organisms grow, develop, and reproduce.
Cellular Organization
- Cells: the basic unit of structure and function in living things.
- Unicellular organisms: single-celled organisms where one cell carries out all life functions.
- Multicellular organisms: organisms consisting of many cells, each specialized for a specific task.
The Chemicals of Life
- Water: is a common chemical found in all living things.
- Carbohydrates: provide energy to cells.
- Proteins and lipids: build cells.
- Nucleic acids: provide chemical instructions for cellular functions.
- DNA: directs the actions of every cell in the body.
Growth and Development
- Growth: an increase in size.
- Development: changes that lead to maturity.
- Multicellular Growth: involves creating new cells and replacing dead ones.
Response to Surroundings
- Stimulus: any change or signal in the environment that causes a reaction.
- Response: an organism's reaction to a stimulus.
Reproduction
- Offspring: new organisms created by reproduction.
- Asexual reproduction: an offspring is identical to the parent.
- Sexual reproduction: two parents combine DNA to create offspring with traits from both.
Energy Use
- Producers: organisms that get energy from sunlight through photosynthesis.
- Consumers: organisms that get energy by eating other living things.
Needs of Living Things
- Water: crucial for survival.
- Food: source of energy.
- Producers (Autotrophs): organisms that make their own food using sunlight.
- Consumers (Heterotrophs): organisms that cannot make their own food and must eat other organisms (autotrophs or heterotrophs).
- Space: all organisms need a place to live, obtain food, and shelter.
- Homeostasis: the maintenance of stable internal conditions, essential for all organisms.
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