Question

Uphill Transport i.e the movement of the molecules from a region of their lower concentration to a region of their higher concentration occurs in:
A. Simple diffusion
B. Facilitated Diffusion
C. Active Transport
D. Both B and C.

Answer 1

Hint: Uphill transport as we know is the movement of the substances from their lower concentration to their higher concentration. Further, diffusion as we all know is the movement of the molecules from their higher concentration to their lower concentration.

Complete answer:
To know the correct answer to the question, we must be aware of the various transport methods inside the cell.
Simple diffusion is nothing but the diffusion that’s been defined above.
Facilitated diffusion is the type of diffusion which also occurs across the concentration gradient but the movement is supported by the presence of various facilitated proteins.
Active transport is the movement of the molecules against the concentration gradient i.e the movement of the molecules from a region of their lower concentration to a region of their higher concentration. These movements require energy which is provided from the energy currency of the cell called ATP (adenosine triphosphate)
Active transport occurs with the help of mobile carrier proteins. We all know that the cell membrane is made up of phospholipid bilayer with protein subunits in them. These proteins have a very important role in the active and passive transport. They act as pumps to push the substances in and out of the cell.

Therefore, the correct answer to the question is option C i.e Active transport.

Note: Here it must also be noted that the active transport is faster than the passive transport because it uses energy in the form of ATP. Saturation effect is known to occur when all the protein pumps are used in the active transport. Further, these protein pumps are specific to specific substances and are also sensitive to inhibitors.