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Questions and Answers
Why is the cell membrane called a selectively permeable membrane?
Why is the cell membrane called a selectively permeable membrane?
- Because it prevents all substances from moving in and out of the cell
- Because it does not allow any materials to enter or exit
- Because it only permits the entry and exit of some materials (correct)
- Because it allows all substances to move in and out of the cell
What is the function of the plasma membrane?
What is the function of the plasma membrane?
- It only allows the entry of materials
- It separates the contents of the cell from its external environment (correct)
- It prevents the movement of all materials
- It allows the entry and exit of all materials
How do substances like carbon dioxide or oxygen move across the cell membrane?
How do substances like carbon dioxide or oxygen move across the cell membrane?
- By osmosis
- By facilitated diffusion
- By diffusion (correct)
- By active transport
What happens to CO2 inside a cell when its concentration is high?
What happens to CO2 inside a cell when its concentration is high?
What is the role of oxygen in terms of cellular entry?
What is the role of oxygen in terms of cellular entry?
Why is it important for the cell membrane to be selectively permeable?
Why is it important for the cell membrane to be selectively permeable?
Which process describes the movement of substances from a region of high concentration to low concentration?
Which process describes the movement of substances from a region of high concentration to low concentration?
What substance accumulates in high concentrations inside a cell and needs to be excreted out?
What substance accumulates in high concentrations inside a cell and needs to be excreted out?
In what direction does CO2 move when there is a concentration difference inside and outside a cell?
In what direction does CO2 move when there is a concentration difference inside and outside a cell?
Which substance enters a cell by diffusion when its internal levels decrease?
Which substance enters a cell by diffusion when its internal levels decrease?
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