Tag: biology

• Active transport is a process by which molecules move across the cell membrane from a region of low concentration to a region of high concentration against the concentration gradient using energy.
  
• This energy requirement is fulfilled by the ATP molecules (metabolic energy).
• The substances which are transported across the cell membrane by active transport are- Na+, K+, Mg2+, and Ca2+.
  
• So, the correct answer is 'Requirement of energy'.

Minerals are absorbed by plants through active transport as minerals are present in the soil mostly in the form of charged particles which fail to move across cell membrane and concentration of minerals in the cell is usually greater than that present in the soil solution. Therefore, most of the minerals are absorbed by active mechanism involving expenditure of energy in the form of ATP.

The Na+/K+ pump uses ATP to move sodium ions out of the cell and potassium ions into the cell, both against their respective concentration gradients. This is a classic example of primary active transport.

• Active transport can be defined as the movement of molecules and ions across a cell membrane from a region of lower concentration (of the molecules) to the region of higher concentration i.e, movement of molecules occurs against the concentration gradient. 
• This transport requires cellular or metabolic energy which is available in the form of ATP molecules produced within the cell.
  
• So, the correct answer is 'ATP'.

Active transport is a physiological or biological process mediated by membrane proteins, not a simple chemical reaction. It relies on ATP, uses carrier proteins, and is highly sensitive to metabolic inhibitors and enzymes that regulate these proteins.

• Active transport can be defined as the movement of molecules or ions across a plasma membrane from a region of lower concentration (of molecules or ions) to a region of higher concentration, against the concentration gradient. 
• For this cellular energy is required which is available in the form of ATP molecule and enzymes.
• So, the correct answer is 'All of the above'.

Active transport is highly sensitive to metabolic inhibitors because it depends on ATP production. If ATP synthesis is inhibited, active transport stops.

Absorption of water takes place by both active and passive absorption.
Water, as per some theory, is absorbed against the concentration gradient. This type of absorption is termed active absorption where the movement is against the concentration gradient and requires energy in the form of ATP.

The monosaccharides glucose and galactose are transported into the epithelial cells by common protein carriers via secondary active transport I.e  by co-transport with sodium ions. The monosaccharides leave these cells via facilitated diffusion and enter the capillaries through intercellular clefts.

• Active transport is the transport where the direct expenditure of energy takes place and the molecules move against the gradient which is from lower concentration to the higher concentration.
• Passive absorption is the absorption which takes place without expenditure of energy. The water molecules move from higher concentration to the lower concentration which is towards the gradient. 
• In diffusion, the ions or molecules randomly diffuses the semipermeable membrane along the concentration gradient.
• Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane.