Master Cells, Genetics, Human Body Systems, Ecology & Evolution – Aligned with U.S. Science Standards
This 50 USA Biology Quiz covers cells, genetics, human body systems, ecology, evolution, and biochemistry — aligned with U.S. middle and high school science standards. Each question includes four answer choices with the correct answer provided for self-checking.
Comment your score below after tallying your correct answers. Perfect for test prep, homework review, or classroom competitions. Share this quiz with classmates to challenge each other and reinforce key biology concepts together.
Top 50 USA Biology Quiz
Results
#1. Which gas do animals release during respiration?
#2. What is the term for a community of living organisms and their physical environment?
#3. Which of these is an example of an inherited trait?
#4. What is the smallest bone in the human body?
#5. What is the name of the structure that connects muscles to bones?
#6. Which level of organization comes after “tissue”?
#7. Which system of the body is responsible for breathing?
#8. What is the main function of the small intestine?
#9. Which part of the brain controls balance and coordination?
#10. Which of these animals is a reptile?
#11. What is the normal pH of human blood?
#12. What is the main function of red blood cells?
#13. Which organelle is found only in plant cells?
#14. What is the name of the sugar found in DNA?
#15. What is the name of the process where water moves across a semipermeable membrane?
#16. Which of these is a carnivore?
#17. What is the process called when plants lose water vapor through their leaves?
#18. Which organ filters blood and produces urine?
#19. Which organelle is responsible for protein synthesis?
#20. Which human body system includes the stomach and intestines?
#21. Which of these is a vertebrate?
#22. Which organ pumps blood throughout the human body?
#23. What type of blood vessel carries blood away from the heart?
#24. Which process do plants use to make food using sunlight?
#25. Which scientist is known for his work on pea plants and heredity?
#26. What is the name of the double helix molecule that carries genetic information?
#27. What is the main function of white blood cells?
#28. What is the name of the fluid that circulates in the heart and blood vessels?
#29. What is the main function of the nervous system?
#30. Which of these is a mammal?
#31. Which of these animals lays eggs?
#32. What is the term for a change in DNA sequence?
#33. Which vitamin is produced by the human skin when exposed to sunlight?
#34. What is the process by which organisms better adapted to their environment survive and reproduce?
#35. What is the green pigment in plants called?
#36. Which organelle is known as the “powerhouse of the cell”?
#37. What is the basic unit of life?
#38. Which of these is a decomposer in an ecosystem?
#39. What is the name of the molecule that carries energy in cells?
#40. What is the process by which cells divide to produce two identical daughter cells?
#41. What is the purpose of photosynthesis?
#42. Which type of cell does not have a nucleus?
#43. What is the term for organisms that make their own food?
#44. Which human body system produces hormones?
#45. Which part of the cell contains the genetic material (DNA)?
#46. Which scientist is known as the “Father of Evolution”?
#47. What does DNA stand for?
#48. What is the largest organ in the human body?
#49. What is the term for an organism’s role in its ecosystem?
#50. Which of these is responsible for blood clotting?
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