Question

Assume that an actively respiring cell has 3x number of $K^{+}$ in its cytoplasm and the 2x number of $K^{+}$ outside. After sometime, x number of $K^{+}$ entered into the cell. What is the process by which $K^{+}$ transport has taken place?

• A. Osmosis
• B. Secondary active transport
• C. Diffusion
• D. Passive transport

Answer 1

The correct option is B Secondary active transport

Secondary active transport is also called as coupled transport in which transport of one ion along the concentration gradient is coupled with the active transport of another ion against the concentration gradient e.g., sodium potassium pump. Whereas, osmosis, diffusion and passive transport system transports single type of ion at a time. Thus, the correct answer is option B.