Are tiny power plants contained within the cell that carry on cellular respiration. a. Mitochondria b. Ribosomes c. Lysosomes d. Golgi
The correct answer and explanation is:
The correct answer is: a. Mitochondria
Explanation:
Mitochondria are often called the “powerhouses” or “tiny power plants” of the cell because they generate the majority of the cell’s supply of adenosine triphosphate (ATP), which is the main energy currency used for various cellular processes. This energy production occurs through a process called cellular respiration.
Cellular respiration is a metabolic process that converts biochemical energy from nutrients, primarily glucose, into ATP. This process involves several stages: glycolysis, the Krebs cycle (citric acid cycle), and the electron transport chain.
- Glycolysis occurs in the cytoplasm, where glucose is broken down into pyruvate, producing a small amount of ATP and NADH.
- The pyruvate then enters the mitochondria, where the Krebs cycle takes place inside the mitochondrial matrix. Here, it is further broken down, releasing electrons carried by molecules like NADH and FADH2.
- These electrons are passed along the electron transport chain, a series of protein complexes located in the inner mitochondrial membrane. This movement of electrons helps pump protons across the membrane, creating a gradient.
- The flow of protons back across the membrane drives the enzyme ATP synthase to produce ATP from ADP.
Mitochondria are unique organelles because they have their own DNA and can replicate independently within the cell. Their double-membrane structure creates distinct environments critical for efficient energy production.
Other options:
- Ribosomes (option b) are involved in protein synthesis, not energy production.
- Lysosomes (option c) contain digestive enzymes to break down waste materials and cellular debris.
- Golgi apparatus (option d) modifies, sorts, and packages proteins and lipids for secretion or use within the cell.
In summary, mitochondria are essential for cellular respiration and energy generation, making them the tiny power plants of the cell.