8 Questions
What is a unifying theme in the field of biology?
The diversity and unity of life explained by evolution
What is the role of genes in organisms?
They transmit hereditary information encoded in genes
At what levels of organization can biologists study life?
From the molecular biology of a cell to the anatomy and physiology of plants and animals
What method do biologists use to make observations and form conclusions?
The scientific method
How long ago did life on Earth emerge?
3.7 billion years ago
What is the mode of nutrition called when an organism makes its own food using sunlight or chemicals?
Autotrophic nutrition
What is the term for organisms that use light energy to photosynthesize and make their own food?
Photoautotrophs
What are bacteria called when they use chemicals to derive energy for their nutrition?
Chemotrophs
Study Notes
Unifying Themes and Levels of Organization
- A unifying theme in the field of biology is the study of life and its diversity.
- Biologists can study life at multiple levels of organization, including molecules, cells, organisms, populations, communities, ecosystems, and the biosphere.
Role of Genes and Nutrition
- Genes play a crucial role in organisms, as they contain the instructions for growth, development, and function.
- The mode of nutrition in which an organism makes its own food using sunlight or chemicals is called autotrophy.
- Organisms that use light energy to photosynthesize and make their own food are called autotrophs.
- Bacteria that use chemicals to derive energy for their nutrition are called chemotrophs.
Origins of Life and Scientific Method
- Life on Earth is believed to have emerged around 3.5 billion years ago.
- Biologists use the scientific method to make observations and form conclusions, involving systematic observation, measurement, and experimentation.
Test your knowledge of key themes and concepts in biology with this quiz. Explore topics such as cell structure, genetics, evolution, and energy processing.
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