PAX PAX Biology 2 — Questions and Answers
Question 1: Which blood type is considered the universal donor?
- A positive
- B negative
- O negative (Correct answer)
- AB positive
Correct answer: O negative
O negative blood has no A, B, or Rh antigens, making it compatible with all blood types.
Question 2: What is osmosis?
- Movement of solutes from high to low concentration
- Movement of water across a semipermeable membrane from low to high solute concentration (Correct answer)
- Active transport of ions into the cell
- Breakdown of glucose for energy
Correct 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.
Question 3: Which part of the neuron receives signals from other neurons?
- Axon
- Myelin sheath
- Dendrites (Correct answer)
- Synapse
Correct answer: Dendrites
Dendrites are tree-like extensions that receive incoming signals from other neurons and transmit them to the cell body.
Question 4: What is the primary function of white blood cells (leukocytes)?
- Transport oxygen
- Carry carbon dioxide
- Defend against infection (Correct answer)
- Produce clotting factors
Correct answer: Defend against infection
White blood cells are the main components of the immune system, defending the body against bacteria, viruses, and other pathogens.
Question 5: Where does photosynthesis primarily occur in plant cells?
- Mitochondria
- Nucleus
- Chloroplasts (Correct answer)
- Ribosomes
Correct answer: Chloroplasts
Chloroplasts contain chlorophyll and are the site of photosynthesis, converting sunlight into glucose.
Question 6: Which organ system is responsible for exchanging oxygen and carbon dioxide?
- Digestive system
- Respiratory system (Correct answer)
- Endocrine system
- Lymphatic system
Correct answer: Respiratory system
The respiratory system, including the lungs and airways, facilitates gas exchange between the blood and the environment.
PAX PAX Biology 2
Which blood type is considered the universal donor?