When proteins help transport molecules in and out of the cell, it is called active transport.

Which of the following best explains the type of cell transport observed by the scientist? Osmosis because the molecules were moving against the concentration gradient. Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

The correct answer is A The student is investigating the passive transport of diffusion.

Facilitated diffusion is the diffusion of solutes through transport proteins in the plasma membrane. Channel proteins, gated channel proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion.

Carrier proteins and channel proteins are the two major classes of membrane transport proteins.

Types

• 1: Channels/pores.
• 2: Electrochemical potential-driven transporters.
• 3: Primary active transporters.
• 4: Group translocators.
• 5: Electron carriers.

What is an example of coupled transport? Glucose-Na+ symporter. It captures the energy from Na+ diffusion to move glucose against the concentration gradient.

During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.

Active transport: moving against a gradient To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells.

Cell transport is movement of materials across cell membranes. Cell transport includes passive and active transport. Passive transport does not require energy whereas active transport requires energy to proceed. Passive transport proceeds through diffusion, facilitated diffusion and osmosis.

Because energy is required in this process, it is known as ‘active’ transport. Examples of active transport include the transportation of sodium out of the cell and potassium into the cell by the sodium-potassium pump. Active transport often takes place in the internal lining of the small intestine.