Cell Theory & Pro vs Eu Review

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What is Cell Theory?

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Cell Theory is a fundamental concept in biology that states: 1) All living organisms are composed of one or more cells, 2) The cell is the basic unit of life, and 3) All cells arise from pre-existing cells.

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What are prokaryotic cells?

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Prokaryotic cells are simple, single-celled organisms that lack a nucleus and membrane-bound organelles. All bacteria are prokaryotic.

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What are eukaryotic cells?

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Eukaryotic cells are complex cells that contain a nucleus and membrane-bound organelles. They can be single-celled or multicellular organisms.

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What is cohesion in the context of water?

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Cohesion is the property of water molecules to stick to each other due to hydrogen bonding, which contributes to phenomena like surface tension.

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What is adhesion in the context of water?

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Adhesion is the property of water molecules to stick to other substances, which helps in processes like capillary action.

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What is capillary action?

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Capillary action is the ability of water to flow in narrow spaces without the assistance of external forces, driven by cohesion and adhesion.

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What did Schleiden contribute to cell theory?

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Matthias Schleiden proposed that all plants are made of cells, contributing to the understanding that all living things are composed of cells.

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What did Schwann contribute to cell theory?

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Theodor Schwann proposed that all animals are made of cells, reinforcing the idea that all living organisms are composed of cells.

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What is a characteristic of eukaryotic cells?

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Eukaryotic cells have membrane-bound organelles, such as the nucleus, mitochondria, and endoplasmic reticulum.

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What is the significance of the nucleus in eukaryotic cells?

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The nucleus is the organelle that contains the cell's genetic material (DNA) and controls cellular activities.