Question:
The main difference between active and passive transport across cell membrane is :
The main difference between active and passive transport across cell membrane is :
Updated On: May 25, 2026
- Passive transport is non-selective wherease active transport is selective
- Passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
- Passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins
- Active transport occurs more rapidly than passive transport
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The Correct Option is B
Solution and Explanation
Answer (b) Passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
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Concepts Used:
Active Transport
Active transport is a type of cellular transport in which molecules (such as glucose, ions, and amino acids) are transferred across a biological membrane to a place where there are already enough of them. As a result, molecules are moved across concentration gradients using chemical energy (for instance, ATP). Root hair cells and the small intestine wall are persistent active transport sites (villi).
Types of Active Transport:
There are two types of active transportation mechanisms such as;
Primary Active Transport
- The sodium-potassium pump, which transports Na+ and K+ into animal cells, is one of the most necessary pumps.
- The transport process is assorted as primary active transport since it uses ATP as an energy source.
- Also, there are the types of Primary Active Transporters:
- P-ATPase: sodium-potassium pump, calcium pump, proton pump
- F-ATPase: mitochondrial ATP synthase, chloroplast ATP synthase
- V-ATPase: vacuolar ATPase
- ABC Transporter (ATP binding tape): MDR, CFTR, and so on.
Secondary Active Transport
- Primary active transport creates electrochemical gradients that store energy that can be released as the ions plunged their gradients.
- Secondary active transport harnesses the energy stored in these gradients to move other substances in the opposite direction of their own gradients.