National League for Nursing (NLN PAX) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the National League for Nursing PAX Exam. Master the content with our quiz featuring multiple choice questions, hints, and explanations. Ensure success on your test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.


Which part of the cell is primarily responsible for energy production?

  1. Nucleus

  2. Ribosome

  3. Mitochondria

  4. Endoplasmic reticulum

The correct answer is: Mitochondria

The mitochondria are often referred to as the "powerhouses" of the cell due to their central role in energy production. They are organelles that conduct cellular respiration, a process where biochemical energy is generated from nutrients and converted into adenosine triphosphate (ATP), the energy currency of the cell. This process occurs through a series of metabolic pathways, including the Krebs cycle and oxidative phosphorylation, which take place within the mitochondria's inner membrane. Mitochondria are uniquely structured to facilitate this function, containing their own DNA and a double membrane that allows for the compartmentalization required for ATP production. This specialization makes them crucial for energy metabolism in aerobic organisms, as they efficiently produce the ATP that fuels various cellular activities. In contrast, the nucleus houses genetic material and is involved in the regulation of gene expression, but it does not directly produce energy. Ribosomes are the sites of protein synthesis, translating messenger RNA into proteins, and while proteins can play roles in various metabolic processes, they do not produce energy themselves. The endoplasmic reticulum is involved in protein and lipid synthesis and processing but does not participate in energy production like the mitochondria do. Thus, the mitochondria's dedicated role in generating ATP cements its