Questions and Answers
What is the function of the plasma membrane in a cell?
Permits the entry and exit of some materials
What is the term used to describe the movement of substances from a region of high concentration to a region of low concentration across a cell membrane?
Diffusion
How do substances like carbon dioxide or oxygen enter or exit the cell?
Diffusion
What is the term for a membrane that allows only certain substances to pass through while restricting others?
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Which statement best describes how CO2 moves out of a cell?
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What happens when there is a difference in the concentration of CO2 inside and outside a cell?
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How is the plasma membrane described in relation to the movement of substances?
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What process allows substances like CO2 and O2 to move across the cell membrane?
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What happens to CO2 when there is a difference in its concentration inside and outside a cell?
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In what direction does CO2 move across the cell membrane in relation to its concentration gradient?
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Which process describes the movement of substances from regions of high concentration to regions of low concentration?
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Why is the cell membrane called selectively permeable?
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What is the process called when water molecules move through a selectively permeable membrane?
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Which cellular organelle is involved in the storage, modification, and packaging of products in vesicles?
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What is the primary role of the Golgi apparatus in a cell?
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How are the Golgi apparatus and endoplasmic reticulum connected within a cell?
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Which process plays a significant role in gaseous exchange between cells and their external environment?
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Study Notes
- The plasma membrane is the outermost covering of a cell that separates its contents from the external environment, allowing the entry and exit of certain materials while preventing the movement of others. It is selectively permeable.
- Movement of substances into and out of the cell occurs through processes like diffusion, where substances like carbon dioxide and oxygen move across the cell membrane from areas of high concentration to low concentration.
- Diffusion is essential for gaseous exchange between cells and their external environment, as seen in the example of CO2 exiting the cell when its concentration is higher inside compared to outside.
- Water molecules also move through the cell membrane via osmosis, following the principles of diffusion.
- The Golgi apparatus, discovered by Camillo Golgi, consists of membrane-bound vesicles arranged in stacks called cisterns. It plays a crucial role in synthesizing, modifying, and packaging materials for distribution within and outside the cell, including the formation of lysosomes.
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Description
Test your knowledge on the cell membrane and how substances move in and out of the cell. Learn about the selective permeability of the plasma membrane and the different mechanisms of substance transport.
