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More Flashcards

(17 cards)

1
Q

What is the main role of the cell membrane in maintaining the cell’s structure?

A

It maintains and preserves the integrity of the cell.

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2
Q

How does the cell membrane control the movement of substances in and out of the cell?

A

By allowing passive diffusion, facilitated diffusion, active transport, and selective transport.

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3
Q

What is passive diffusion?

A

The movement of simple substances like water and some ions across the membrane without energy.

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4
Q

What substances typically pass through the membrane via passive diffusion?

A

Water and some small ions.

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5
Q

What is facilitated diffusion?

A

Movement of substances like glucose and amino acids across the membrane using carrier proteins, without needing energy.

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6
Q

Why does facilitated diffusion not require energy?

A

Because it occurs along the concentration gradient.

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7
Q

What is the role of carrier proteins in facilitated diffusion?

A

They help specific substances pass through the membrane.

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8
Q

What is active transport?

A

Movement of substances against the concentration gradient, requiring energy (ATP).

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9
Q

Why is energy needed in active transport?

A

Because substances are moved from low to high concentration.

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10
Q

What is selective transport?

A

A process where membrane receptors select and allow specific substances to enter the cell

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11
Q

What role do receptors on the cell membrane play in selective transport?

A

They identify and allow only specific substances to enter the cell.

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12
Q

What is phagocytosis?

A

The process where the cell engulfs large particles or microorganisms.

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13
Q

What is pinocytosis?

A

The process where the cell takes in fluid and dissolved substances.

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14
Q

How is pinocytosis different from phagocytosis?

A

Pinocytosis involves fluids, while phagocytosis involves solids or particles.

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15
Q

How does the cell membrane help regulate interaction between cells?

A

Through special types of cell junctions.

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16
Q

What are cell junctions?

A

Structures that connect adjacent cells and help in communication and cohesion.

17
Q

What is Exocytosis ?

A

The process by which the cell expels materials in vesicles to the outside.