Concentration Gradients and Diffusion quiz Flashcards

Diffusion is the net movement of a substance from an area of high concentration to an area of low concentration.

It means the molecule is moving from an area of high concentration to an area of low concentration.

The red dye molecules diffuse from areas of high concentration to areas of low concentration until equilibrium is reached.

Equilibrium is when the dye particles are evenly distributed throughout the beaker, resulting in equal dye concentration in all areas.

A semi-permeable membrane allows certain molecules to cross while preventing others from doing so.

Selectively permeable.

Because the membrane is selectively permeable and does not allow sodium ions to pass through freely.

The specific properties of oxygen molecules allow them to cross the membrane freely.

Concentration gradients drive the movement of molecules from areas of high concentration to areas of low concentration.

Equilibrium signifies that the concentration of molecules is uniform throughout the medium, indicating no net movement.

Selective permeability determines which molecules can passively diffuse, while active transport moves molecules against their concentration gradient.

Active transport requires energy to move molecules against their concentration gradient, while passive transport does not.

ATP provides the energy needed for active transport to move molecules against their concentration gradient.

Abiotic factors such as temperature and pressure can affect the rate and efficiency of diffusion.

Facilitated diffusion is a type of passive transport where molecules move down their concentration gradient with the help of a protein channel.

A concentration gradient is a difference in the concentration of a substance between two different areas.

It means the molecule is moving from an area of high concentration to an area of low concentration, requiring no energy.

Energy is required for a molecule to move from an area of low concentration to an area of high concentration.

In diffusion, molecules move from a region of higher concentration to a region of lower concentration without requiring energy.

Active transport requires energy to move molecules against their concentration gradient, while diffusion does not require energy and moves molecules down their concentration gradient.

Osmosis is the process where water moves across a semipermeable membrane to a region of high solute concentration.

Activation energy is the energy required to move molecules against their concentration gradient in active transport.

Passive transport does not require energy and moves molecules down their concentration gradient, while active transport requires energy to move molecules against their concentration gradient.

The concentration gradient drives the movement of substances across cell membranes, influencing processes like diffusion and osmosis.

Equilibrium is reached when the concentration of molecules is the same throughout, meaning there is no net movement of molecules in diffusion.

Simple diffusion occurs directly through the lipid bilayer, while facilitated diffusion requires a protein channel to help move molecules across the membrane.

The cell membrane regulates the movement of substances in and out of the cell, maintaining concentration gradients essential for cellular function.

Concentration gradients are crucial for maintaining homeostasis, as they allow cells to regulate the internal environment by controlling the movement of substances.