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PAX Biology Flashcards

6 cards from real PAX practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 PAX Biology flashcards as text

  1. Which blood type is considered the universal donor?

    Answer: O negative

    O negative blood has no A, B, or Rh antigens, making it compatible with all blood types.

  2. What is osmosis?

    Answer: Movement of water across a semipermeable membrane from low to high solute concentration

    Osmosis is the passive movement of water through a semipermeable membrane from an area of lower solute concentration to higher solute concentration.

  3. Which part of the neuron receives signals from other neurons?

    Answer: Dendrites

    Dendrites are tree-like extensions that receive incoming signals from other neurons and transmit them to the cell body.

  4. What is the primary function of white blood cells (leukocytes)?

    Answer: Defend against infection

    White blood cells are the main components of the immune system, defending the body against bacteria, viruses, and other pathogens.

  5. Where does photosynthesis primarily occur in plant cells?

    Answer: Chloroplasts

    Chloroplasts contain chlorophyll and are the site of photosynthesis, converting sunlight into glucose.

  6. Which organ system is responsible for exchanging oxygen and carbon dioxide?

    Answer: Respiratory system

    The respiratory system, including the lungs and airways, facilitates gas exchange between the blood and the environment.

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  1. nln.org — Eligibility, test delivery, passing score, test dates, score validity, fees, retake policy, score release, exam information · verified Oct 2026