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13 Questions

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Selective Permeability of Cell Membrane

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Questions and Answers

Which type of substances can enter the cell membrane without the need for protein helpers?

Polar, hydrophilic molecules

Nonpolar, hydrophobic molecules (correct)

Glucose

Ions

What is the main factor that affects the rate of diffusion in passive transport processes?

Availability of carrier proteins

Steepness of the concentration gradient (correct)

Presence of aquaporins

Opening of gated channels

In the context of active transport, what is the role of ATP?

To open aquaporins

To provide energy for pumping molecules against their concentration gradient (correct)

To facilitate diffusion of ions

To maintain turgor pressure in cells

Which process involves the cell membrane engulfing particles or fluids from the external environment?

Endocytosis Signup and view all the answers

What is the color indicator used in the Dialysis Bag with Starch and Iodine Lab Demo?

Iodine Signup and view all the answers

How do aquaporins facilitate the movement of water across the cell membrane?

By forming channel proteins for water transport Signup and view all the answers

What happens to animal cells in a hypertonic solution?

Cells shrink (crenation) Signup and view all the answers

What type of substances typically require protein helpers to cross the cell membrane?

Polar, hydrophilic molecules Signup and view all the answers

What is the purpose of the Sodium/Potassium Pump in cells?

For proper functioning of neurons Signup and view all the answers

What is affected by whether gated channels are open or closed in facilitated diffusion?

Rate of diffusion Signup and view all the answers

What type of molecules make up the tails of the phospholipid bilayer?

Hydrophobic Signup and view all the answers

What role do aquaporins play in facilitating the movement of water through the cell membrane?

Form channel proteins for water transport Signup and view all the answers

What is the effect of hypotonic solution on plant cells?

Turgor pressure increases Signup and view all the answers