Question

The energy necessary for active transport across cytoplasmic membranes is believed to come from

• A. ATP
• B. diffusion
• C. osmosis
• D. kinetic energy

Answer 1

The correct option is A

ATP

The correct option is A

Explanation of the correct option:

1. ATP is the energy currency of our body produced by the oxidation of food in the cell.
2. ATP is utilized to proceed with different metabolic processes.
3. Active transport is the movement of molecules across a cell membrane in the direction against the concentration gradient i.e., moving from an area of lower concentration to an area of higher concentration with the involvement of energy in the form of ATP.
4. Mitochondria are the cell organelles that generate electricity or power for the cell to perform functions.

Explanation of the incorrect option:

Option B:

1. Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
2. Diffusion helps in the movement of substances in and out of the cells.

Option C:

1. Osmosis is the process in which solvent molecules pass through a semi-permeable membrane from an area of higher concentration to an area of lower concentration.

Option D:

1. The kinetic energy is the measure of the work that an object does by virtue of its motion.
2. A simple act like walking, jumping, throwing, and falling involves kinetic energy.

Final answer: The energy necessary for active transport across cytoplasmic membranes is believed to come from ATP.