Fall Semester Review

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What is homeostasis?

Back

Homeostasis is the process by which a cell or organism maintains a stable internal environment despite changes in external conditions.

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How do cells maintain homeostasis?

Back

Cells maintain homeostasis by regulating what enters and leaves the cell, ensuring balance in their internal environment.

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What do viruses and living cells have in common?

Back

Both viruses and living cells store genetic information.

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What is the energy loss between trophic levels?

Back

Approximately 90% of energy is lost as heat between the trophic level of producers and primary consumers.

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What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

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What is passive transport?

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Passive transport is the movement of molecules across a cell membrane without the use of energy, typically from an area of higher concentration to an area of lower concentration.

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What is diffusion?

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Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.

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What is osmosis?

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Osmosis is the diffusion of water molecules through a selectively permeable membrane.

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What happens if a key species is removed from a food web?

Back

Removing a key species, such as the grasshopper, can significantly impact other organisms in the food web, particularly those that rely on it for food.

Front

What is a food web?

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A food web is a complex network of feeding relationships among various organisms in an ecosystem.