Membrane Transport

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (usually in the form of ATP).

Front

What is the primary difference between active transport and passive transport?

Back

The primary difference is that active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What happens to a cell placed in a hypertonic solution?

Back

A cell placed in a hypertonic solution will lose water and shrink due to osmosis.

Front

Define hypertonic solution.

Back

A hypertonic solution is one that has a higher concentration of solutes compared to another solution, leading to the movement of water out of a cell placed in that solution.

Front

What is homeostasis?

Back

Homeostasis is the state of steady internal conditions maintained by living organisms, including the regulation of water, temperature, and pH.

Front

What role do proteins play in the phospholipid bilayer?

Back

Proteins form channels and pumps in the phospholipid bilayer, facilitating the transport of substances across the cell membrane.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane is a barrier that allows certain substances to pass through while blocking others, crucial for maintaining cellular homeostasis.

Front

What is the significance of equilibrium in biological systems?

Back

Equilibrium in biological systems is significant because it represents a balanced state where the concentrations of substances are equal, allowing for stable cellular function.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane without the use of energy.