Biology Review

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What is homeostasis and how does sweating help maintain it during exercise?

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Homeostasis is the process by which living organisms regulate their internal environment to maintain stable, constant conditions. Sweating helps maintain homeostasis by regulating body temperature; as sweat evaporates from the skin, it cools the body down.

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What is the role of a contractile vacuole in protists?

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A contractile vacuole helps protists eliminate excess liquid through a pumping process, which reduces pressure inside the cell and prevents it from bursting.

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What does it mean for an organism to be heterotrophic?

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Heterotrophic organisms obtain nutrients by consuming other organisms or their products, as they cannot produce their own food.

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How do cells from the same organism exhibit different shapes and functions?

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Cells from the same organism can have different shapes and functions due to differentiation, where different parts of the DNA are activated in each type of cell, leading to specialized structures and functions.

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Why does the rate of a biochemical reaction decrease at high temperatures?

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The rate of a biochemical reaction decreases at high temperatures because the shape of the enzyme changes, which can affect its ability to bind to substrates.

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What is ATP and why is it important for cellular processes?

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ATP (adenosine triphosphate) is the primary energy carrier in cells. It provides the energy needed for various cellular processes, including muscle contraction, nerve impulse propagation, and biochemical reactions.

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What is the significance of enzyme shape in biochemical reactions?

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The shape of an enzyme is crucial for its function; it determines the enzyme's ability to bind to its substrate and catalyze a reaction. Changes in shape can lead to decreased activity or inactivation.

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What is differentiation in biology?

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Differentiation is the process by which cells become specialized in structure and function, allowing for the development of different cell types within an organism.

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How does temperature affect enzyme activity?

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Temperature affects enzyme activity by influencing the kinetic energy of molecules. Optimal temperatures increase reaction rates, while extreme temperatures can denature enzymes, reducing their activity.

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What are the main differences between autotrophic and heterotrophic organisms?

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Autotrophic organisms produce their own food through processes like photosynthesis, while heterotrophic organisms obtain food by consuming other organisms or their products.

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