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What is the cell theory?
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The cell theory states that all living organisms are composed of cells, cells are the basic unit of life, and all cells arise from pre-existing cells.
Additional Info
This theory emphasizes the importance of cells as the fundamental building blocks of life. It was developed in the mid-19th century by scientists such as Schleiden, Schwann, and Virchow.
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Define homeostasis.
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Homeostasis is the process by which an organism maintains a stable internal environment despite changes in external conditions.
Additional Info
Examples include temperature regulation in mammals and the regulation of blood sugar levels in humans.
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What are the four macromolecules essential for life?
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The four macromolecules are carbohydrates, lipids, proteins, and nucleic acids. Each plays a crucial role in biological processes.
Additional Info
Carbohydrates provide energy, lipids store energy, proteins perform a variety of functions including enzymes and structural components, and nucleic acids (DNA/RNA) store and transmit genetic information.
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Explain the process of photosynthesis.
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Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose, using carbon dioxide and water, while releasing oxygen as a byproduct.
Additional Info
The overall equation is: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2. This process occurs mainly in the chloroplasts of plant cells.
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What is the difference between prokaryotic and eukaryotic cells?
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Prokaryotic cells are simple, unicellular organisms without a nucleus or membrane-bound organelles, while eukaryotic cells are more complex, with a defined nucleus and organelles.
Additional Info
Examples of prokaryotes include bacteria and archaea, while examples of eukaryotes include plants, animals, and fungi.
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Describe the structure and function of DNA.
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DNA (deoxyribonucleic acid) is a double-helix structure composed of nucleotides, which include a sugar, phosphate group, and a nitrogenous base. It carries genetic information necessary for the growth, development, and reproduction of organisms.
Additional Info
The sequence of bases (A, T, C, G) encodes the instructions for building proteins, which perform most of the functions in a cell.
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What role do enzymes play in biological reactions?
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Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur.
Additional Info
Each enzyme is specific to a particular substrate and operates optimally at a certain temperature and pH. For example, amylase breaks down starch into sugars.
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What is natural selection?
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Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring. It is a key mechanism of evolution.
Additional Info
Darwin's theory of evolution by natural selection explains how species evolve over time through variations and adaptations.
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What are the stages of cellular respiration?
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Cellular respiration consists of three main stages: glycolysis, the Krebs cycle (citric acid cycle), and oxidative phosphorylation (electron transport chain).
Additional Info
This process converts glucose into ATP, the energy currency of the cell, with carbon dioxide and water as byproducts.
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What is a food chain?
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A food chain is a linear sequence that shows how energy and nutrients flow from one organism to another in an ecosystem, typically starting from producers to various levels of consumers.
Additional Info
For example, in a simple food chain: grass (producer) → rabbit (primary consumer) → fox (secondary consumer).