Table of Contents
- 1 What is the process in which molecules are moved from high to low concentration with the help of a protein?
- 2 What is it called when molecules move through a carrier protein?
- 3 Which type of transport is mostly commonly used?
- 4 Which processes can move molecules against a concentration gradient?
- 5 How are molecules transported across the plasma membrane?
- 6 How are large molecules move down the concentration gradient?
What is the process in which molecules are moved from high to low concentration with the help of a protein?
In facilitated transport, also called facilitated diffusion, material moves across the plasma membrane with the assistance of transmembrane proteins down a concentration gradient (from high to low concentration) without the expenditure of cellular energy.
What is it called when molecules move through a carrier protein?
Facilitated diffusion is a process by which molecules are transported across the plasma membrane with the help of membrane proteins.
What mechanism is used to transport a molecule from a low concentration to a high concentration quizlet?
Active transport can be defined as: Active transport is the movement of a substance from a region of low concentration to a region of high concentration (against a concentration gradient) and requires energy in the form of ATP (adenosine triphosphate).
What is it called when carrier molecules are used to move molecules down a concentration gradient?
In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.
Which type of transport is mostly commonly used?
Worldwide, the most widely used modes for passenger transport are the Automobile (16,000 bn passenger km), followed by Buses (7,000), Air (2,800), Railways (1,900), and Urban Rail (250).
Which processes can move molecules against a 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.
What is it called when carrier molecules are used to move molecules down a concentration gradient quizlet?
What is it called when carrier molecules are used to move molecules down a concentration gradient? Facilitated diffusion.
How are nonpolar molecules transported in a cell?
Nonpolar molecules (ex: CO2 & O2) move across the lipid bilayer down the concentration gradient diffusion Large molecules such as glucose move down the concentration gradient with the help of proteins facilitated diffusion Diffusion of water molecules through the cell membrane down (with) the concentration gradient osmosis
How are molecules transported across the plasma membrane?
Facilitated diffusion is a process by which molecules are transported across the plasma membrane with the help of membrane proteins. A concentration gradient exists that would allow ions and polar molecules to diffuse into the cell, but these materials are repelled by the hydrophobic parts of the cell membrane.
How are large molecules move down the concentration gradient?
Large molecules such as glucose move down the concentration gradient with the help of proteins facilitated diffusion Diffusion of water molecules through the cell membrane down (with) the concentration gradient osmosis Movement of substances against the concentration gradient; requires energy
How does active transport work against an electrochemical gradient?
The electrical and concentration gradients of a membrane tend to drive sodium into and potassium out of the cell, and active transport works against these gradients. To move substances against a concentration or electrochemical gradient, the cell must utilize energy in the form of ATP during active transport.