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Active Transport and Cytosis Quiz

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Questions and Answers

What is the main function of the cell membrane?

Regulating cell division

Facilitating communication between cells

Providing structural support to the cell

Controlling the movement of substances in and out of the cell (correct)

Which component of the cell membrane acts as recognition sites and antigens?

Phospholipids

Cholesterol

Glycoproteins (correct)

Intrinsic proteins

How do phospholipids contribute to the fluidity of the cell membrane?

By forming a bilayer (correct)

By serving as channels for water-soluble molecules

By waterproofing the membrane

By regulating stability

What is the function of cholesterol in the cell membrane?

Waterproofing the membrane and controlling its stability Signup and view all the answers

Which protein type allows active and passive transport across the cell membrane?

Carrier proteins Signup and view all the answers

In which type of protein do diffusion of polar molecules and ions happen?

Channel proteins Signup and view all the answers

Which of the following best describes the role of cholesterol in the cell membrane?

Helps to stabilize the phospholipid bilayer and maintain membrane fluidity Signup and view all the answers

What is the main function of glycoproteins in the cell membrane?

Acting as recognition sites for cell-cell communication Signup and view all the answers

In the context of the cell membrane, what role do carrier proteins play?

Facilitating active transport of molecules Signup and view all the answers

How does an increase in diffusion gradient affect gas exchange by diffusion?

Increases the rate of gas exchange Signup and view all the answers

Which factor contributes to maintaining the fluidity of the cell membrane?

The presence of unsaturated fatty acids in the phospholipids Signup and view all the answers

What is the primary function of endocytosis in terms of membrane transport?

To transport large particles into the cell by enclosing them in vesicles Signup and view all the answers

How does water potential change as solutes are added to a solution?

Water potential decreases as solutes are added Signup and view all the answers

What is the role of surface area in affecting gas exchange by diffusion?

A larger surface area leads to faster gas exchange rate Signup and view all the answers

What is measured by water potential in a system?

The pressure exerted by water molecules that are free to move Signup and view all the answers

What effect does decreasing diffusion distance have on gas exchange through diffusion?

Increases diffusion rate due to shorter distances to travel Signup and view all the answers