Which of the following organelles is sometimes called the powerhouse of the cell, because of its role in ATP production? Multiple Choice Mitochondria Lysosomes Golgi apparatus Centrosome
The correct answer and explanation is:
Correct Answer: Mitochondria
Explanation (300 words):
The mitochondria are often referred to as the “powerhouse of the cell” because they play a central role in producing adenosine triphosphate (ATP)—the primary energy currency of the cell. Almost every activity in the cell that requires energy, from muscle contraction to active transport and cell division, relies on ATP.
Mitochondria generate ATP through a process known as cellular respiration, specifically aerobic respiration, which occurs in several stages:
- Glycolysis (in the cytoplasm): Breaks down glucose into pyruvate.
- Krebs cycle (in the mitochondrial matrix): Further breaks down the products of glycolysis and releases electrons.
- Electron Transport Chain (ETC) (in the inner mitochondrial membrane): Uses the electrons to pump protons and generate a proton gradient that drives ATP synthesis via the enzyme ATP synthase.
The inner membrane of the mitochondria is specially structured with folds called cristae, which increase surface area and enhance the production of ATP.
While lysosomes are responsible for digesting waste and worn-out organelles using enzymes, they are not involved in energy production.
The Golgi apparatus functions as a packaging and distribution center for proteins and lipids made in the cell but does not produce ATP.
The centrosome plays a key role in organizing microtubules and is crucial during cell division but has no direct role in ATP production.
Mitochondria also have their own DNA and can reproduce independently of the cell cycle, a feature thought to be evidence of their evolutionary origin from free-living prokaryotic organisms.
In summary, because of their unique role in producing ATP through cellular respiration, mitochondria are aptly known as the powerhouse of the cell.