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Questions and Answers
Which of the following correctly describes the primary unit of life in all living organisms?
Which of the following correctly describes the primary unit of life in all living organisms?
What type of reproduction involves two parents and results in offspring that differ from the parents?
What type of reproduction involves two parents and results in offspring that differ from the parents?
What is the role of DNA in living organisms?
What is the role of DNA in living organisms?
Which process describes how organisms keep their internal environment stable?
Which process describes how organisms keep their internal environment stable?
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How do multicellular organisms differentiate from unicellular organisms?
How do multicellular organisms differentiate from unicellular organisms?
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Which characteristic is essential for the survival of organisms in response to environmental changes?
Which characteristic is essential for the survival of organisms in response to environmental changes?
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What term describes the energy processes in living organisms involving breaking down and building up materials?
What term describes the energy processes in living organisms involving breaking down and building up materials?
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What process best describes how organisms develop over time through gradual changes in their characteristics?
What process best describes how organisms develop over time through gradual changes in their characteristics?
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Study Notes
What is Biology?
- Biology is the study of living things, also called organisms.
- Organisms include bacteria, protists, fungi, plants, and animals.
- All organisms share eight basic characteristics.
Characteristics of Living Things
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All organisms are made of cells.
- Organisms are grouped by the number of cells:
- Unicellular organisms are composed of a single cell.
- Multicellular organisms contain multiple, specialized cells.
- Organisms are grouped by the number of cells:
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Organisms reproduce to pass on their genetic traits.
- There are two main types of reproduction:
- Sexual reproduction involves two parents, a sperm fertilizing an egg to create a zygote. Offspring are genetically different from their parents.
- Asexual reproduction involves a single organism or cell. Offspring are genetically identical to the parent.
- There are two main types of reproduction:
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Living organisms have a genetic code.
- DNA (deoxyribonucleic acid) contains the genetic code for all organisms.
- DNA provides instructions for producing the proteins that make up cells and carry out their functions.
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Organisms grow and develop.
- Growth occurs through an increase in the number and size of cells.
- Development refers to the process of an organism maturing into an adult form.
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Living organisms require food and energy.
- Metabolism is the process of breaking down and building up materials within an organism to support life processes.
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Organisms respond to stimuli.
- Organisms respond to changes in their environment, such as temperature, water availability, and food supply, to ensure survival and reproduction.
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Organisms maintain a stable internal environment (homeostasis).
- Homeostasis is the process of maintaining a stable internal environment, including factors like pH, temperature, and water balance, essential for life.
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As a group, living things evolve (change over time).
- Evolution is the gradual change in the characteristics of a population over generations.
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Description
Explore the fundamental concepts of biology, including the characteristics of living organisms and the importance of cells. This quiz covers unicellular and multicellular organisms, reproduction methods, and the role of DNA in genetics. Understand the eight basic characteristics that define life.
