Table of Contents
What is active transport GCSE AQA?
Substances are transported passively down concentration gradients. Often, substances have to be moved from a low to a high concentration – against a concentration gradient. Active transport is a process that is required to move molecules against a concentration gradient.
What is active transport in biology GCSE?
Active transport is the opposite of diffusion and osmosis as particles move from a region of low concentration to a region of high concentration. In order to transport the dissolved molecules from a region of low to high concentration, it requires energy which is released during cell respiration.
What are the 3 key features of active transport?
Active transport requires a specialized carrier molecule, a protein, and the expenditure of cellular energy; transfer across membranes can therefore occur against a concentration gradient.
What is active transport and examples?
Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
What factors affect active transport?
The rate of active transport is affected by: The speed of individual carrier proteins – the faster they work, the faster the rate of active transport. The number of carrier proteins present – the more proteins there are, the faster the rate of active transport.
How does active transport occur?
It occurs when molecules such as glucose or amino acids move from high concentration to low concentration facilitated by carrier proteins or pores in the membrane. Active transport requires energy for the process by transporting molecules against a concentration or electrochemical gradient.
What substances move active transport?
Substances transported by active transport are sugars, most amino acids, organic acids, and a number of inorganic ions, such as sulfate, phosphate, and potassium.
What is an example of an 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.
What is active transport in biology?
Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The particles move against the concentration gradient, using energy released during respiration. Sometimes dissolved molecules are at a higher concentration inside
What is the difference between active transport and concentration gradient?
Often, substances have to be moved from a low to a high concentration – against a concentration gradient. Active transport is a process that is required to move molecules against a concentration gradient.The process requires energy.
What is the current specification for GCSE Physical Education?
GCSE Physical Education. The current specification (version 1.2) is for courses commencing September 2018. In summer 2019, we’ll accept practical assessments based on both the previous (version 1.1) and updated (version 1.2) specifications.
What is the difference between active transport and diffusion and osmosis?
Active transport vs diffusion and osmosis Diffusion Osmosis Active transport Down a concentration gradient ✓ ✓ ✗ Against a concentration gradient ✗ ✗ ✓ Energy needed ✗ ✗ ✓ Substance moved Dissolved solutes Water Dissolved solutes