Carrier – mediated: Transport of some molecules are helped across the membrane by a membrane component. For example: glucose is transported by a glucose carrier. Channel – mediated: Movement of small, polar molecules along its concentration gradient by a carrier protein.
Q. How do substances move in and out of the cell membrane?
In facilitated diffusion, substances move into or out of cells down their concentration gradient through protein channels in the cell membrane. Simple diffusion and facilitated diffusion are similar in that both involve movement down the concentration gradient.
Table of Contents
- Q. How do substances move in and out of the cell membrane?
- Q. What is the most important active transport system and why is it important?
- Q. What happens in primary active transport?
- Q. Which of the following is carrier mediated transport system?
- Q. What is mediated transport for Class 9?
- Q. How does the movement of substances takes place in the cell class 9?
- Q. What is transport and its types?
- Q. What do you mean by hypertonic solution Class 9?
Q. What is the most important active transport system and why is it important?
Active transport is important because it allows the cell to move substances against the concentration gradient.
Q. What happens in primary active transport?
Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
Q. Which of the following is carrier mediated transport system?
2. Carrier mediated transport: Movement which occurs across membrane, such as blood-brain barrier and GIT mucosa. The passage of glucose, amino acids, and other polar molecules through the cell membrane is mediated by carrier proteins in the cell membrane.
Q. What is mediated transport for Class 9?
Mediated Transport: Such essential molecules are moved across the membrane by special proteins called transport proteins or permeases. This process of forced diffusion of certain substances through the plasma membrane is called mediated transport.
Q. How does the movement of substances takes place in the cell class 9?
Answer. Movement of substance in and out of the cells takes place through a process called diffusion. Explanation: Like human body utilizes the required content and excretes the unwanted content, plant also does the same process through method called diffusion.
Q. What is transport and its types?
The different modes of transport are air, water, and land transport, which includes Rails or railways, road and off-road transport. Other modes also exist, including pipelines, cable transport, and space transport. Each mode has its own infrastructure, vehicles, transport operators and operations.
Q. What do you mean by hypertonic solution Class 9?
A hypertonic solution is one that has a higher solute concentration outside the cell than inside. If a cell is placed in a hypertonic solution, the cell will shrink due to water osmotically moving out. A solution whose concentration is less than the cell sap or inside a cell.
