Osmosis

What molecules can diffuse through the cell membrane?

Steroids, uncharged molecules, and small molecules can diffuse across the cell membrane.

What molecules cannot diffuse across the cell membrane?

Ions (charged molecules) and large molecules cannot diffuse across the membrane.

How does temperature affect the rate of diffusion?

Cooler water temperature slows diffusion, while warmer water temperature speeds it up.

What is the relationship between molecular weight and diffusion rate?

Heavier molecules diffuse more slowly than lighter ones.

Define diffusion.

Diffusion is the movement of solutes from high concentration to low concentration until equilibrium is reached.

Does diffusion require energy?

No, diffusion does not require energy (ATP), it is a passive process.

What is a universal solvent?

Water is known as a universal solvent.

Define osmosis.

Osmosis is the movement of water across a membrane.

What happens to water movement in a hypertonic environment?

Water moves out of the cell in a hypertonic environment.

What happens to water movement in a hypotonic environment?

Water moves into the cell in a hypotonic environment.

What happens to water movement in an isotonic environment?

Water moves in and out of the cell at equal rates in an isotonic environment.

What is hemolysis?

Hemolysis is when red blood cells burst due to being placed in a hypotonic environment.

What is plasmolysis?

Plasmolysis is when plant cells shrink after being placed in a hypertonic environment.

What is the main function of active transport?

Active transport moves substances against their concentration gradient, requiring energy from the cell.

In what environment do red blood cells burst?

Red blood cells burst in a hypotonic environment.

In what environment do plant cells shrink?

Plant cells shrink in a hypertonic environment.

Which types of molecules can easily pass through lipid membranes?

Lipid-soluble molecules like steroids can easily pass through lipid membranes.

What type of molecules are unable to cross cell membranes easily?

Charged ions and large molecules cannot easily cross cell membranes.

What does it mean for a solution to be hypertonic?

A hypertonic solution has a higher concentration of solutes compared to the cell.

What does it mean for a solution to be hypotonic?

A hypotonic solution has a lower concentration of solutes compared to the cell.

What does it mean for a solution to be isotonic?

An isotonic solution has the same concentration of solutes as the cell.

What is a factor that slows down the rate of diffusion?

Cooler temperatures slow down the rate of diffusion.

How does active transport differ from passive transport?

Active transport requires energy while passive transport does not.

What role do kidneys play in osmosis?

Kidneys regulate water movement through osmosis across different concentration environments.

What happens to a plant cell in a hypotonic environment?

In a hypotonic environment, water enters the plant cell, making it turgid.

How do smaller molecules compare in diffusion rates with larger molecules?

Smaller molecules diffuse more quickly than larger molecules.

What can be said about the energy requirement for diffusion?

Diffusion is passive and does not require ATP.

What condition can lead to the bursting of red blood cells?

Being placed in a hypotonic solution leads to bursting of red blood cells.

What is the opposite of hemolysis?

Plasmolysis is the opposite of hemolysis.

How do environmental conditions affect the diffusion rate?

Higher temperatures typically increase the diffusion rate.

What is the importance of water as a solvent in biological processes?

Water facilitates chemical reactions by dissolving various solutes.

What happens during osmosis in plant cells when they are in a hypertonic environment?

Water moves out of the cell, causing it to shrink.

What is the primary purpose of the cell membrane regarding diffusion?

The cell membrane regulates what molecules can enter or leave the cell through diffusion.

Which molecules move from high to low concentration during diffusion?

Solutes move from high concentration to low concentration during diffusion.

What is the implication of a universal solvent in biological systems?

A universal solvent allows for the transport of nutrients and waste products within cells.

How is hemolysis an example of osmosis?

Hemolysis illustrates osmosis as water movement causes red blood cells to burst in a hypotonic solution.

What type of transport mechanism allows for water movement into cells?

Osmosis is the transport mechanism that allows for water movement into cells.

Why do large molecules have difficulty in diffusing through cell membranes?

Due to their size, large molecules cannot easily pass through the lipid bilayer of cell membranes.