IB Diploma Biology Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
What is biology the study of?
✔✔ Living organisms and life processes
What characteristic do all living things share?
✔✔ They carry out metabolism
What molecule stores energy for immediate use in cells?
✔✔ ATP
What is the function of the cell membrane?
✔✔ Controls movement of substances in and out of the cell
What structure contains genetic material in eukaryotic cells?
✔✔ Nucleus
What is the function of mitochondria?
✔✔ Aerobic respiration
What type of cells lack a nucleus?
1
,✔✔ Prokaryotic cells
What molecule forms the backbone of cell membranes?
✔✔ Phospholipids
What process forms new cells for growth and repair?
✔✔ Mitosis
What is the role of enzymes in metabolism?
✔✔ Catalyse biochemical reactions
What happens to enzymes at very high temperatures?
✔✔ They denature
What is diffusion?
✔✔ Movement of particles from high to low concentration
What process requires energy to move substances against a gradient?
✔✔ Active transport
What is osmosis?
✔✔ Movement of water across a partially permeable membrane
2
,What happens to plant cells in hypotonic solutions?
✔✔ They become turgid
What pigment absorbs light in photosynthesis?
✔✔ Chlorophyll
Where does photosynthesis occur?
✔✔ Chloroplasts
What gas is taken in during photosynthesis?
✔✔ Carbon dioxide
What gas is released during respiration?
✔✔ Carbon dioxide
What process releases energy from glucose?
✔✔ Cellular respiration
Where does aerobic respiration occur?
✔✔ Mitochondria
3
, What is fermentation?
✔✔ Anaerobic breakdown of glucose
What molecule carries oxygen in red blood cells?
✔✔ Haemoglobin
What is the function of red blood cells?
✔✔ Transport oxygen
What type of blood vessel carries blood away from the heart?
✔✔ Artery
What structure prevents backflow of blood in veins?
✔✔ Valves
What is the role of the heart?
✔✔ Pump blood around the body
What is immunity?
✔✔ Ability to resist disease
What cells produce antibodies?
4
Answers | Latest Version | 2025/2026 |
Correct & Verified
What is biology the study of?
✔✔ Living organisms and life processes
What characteristic do all living things share?
✔✔ They carry out metabolism
What molecule stores energy for immediate use in cells?
✔✔ ATP
What is the function of the cell membrane?
✔✔ Controls movement of substances in and out of the cell
What structure contains genetic material in eukaryotic cells?
✔✔ Nucleus
What is the function of mitochondria?
✔✔ Aerobic respiration
What type of cells lack a nucleus?
1
,✔✔ Prokaryotic cells
What molecule forms the backbone of cell membranes?
✔✔ Phospholipids
What process forms new cells for growth and repair?
✔✔ Mitosis
What is the role of enzymes in metabolism?
✔✔ Catalyse biochemical reactions
What happens to enzymes at very high temperatures?
✔✔ They denature
What is diffusion?
✔✔ Movement of particles from high to low concentration
What process requires energy to move substances against a gradient?
✔✔ Active transport
What is osmosis?
✔✔ Movement of water across a partially permeable membrane
2
,What happens to plant cells in hypotonic solutions?
✔✔ They become turgid
What pigment absorbs light in photosynthesis?
✔✔ Chlorophyll
Where does photosynthesis occur?
✔✔ Chloroplasts
What gas is taken in during photosynthesis?
✔✔ Carbon dioxide
What gas is released during respiration?
✔✔ Carbon dioxide
What process releases energy from glucose?
✔✔ Cellular respiration
Where does aerobic respiration occur?
✔✔ Mitochondria
3
, What is fermentation?
✔✔ Anaerobic breakdown of glucose
What molecule carries oxygen in red blood cells?
✔✔ Haemoglobin
What is the function of red blood cells?
✔✔ Transport oxygen
What type of blood vessel carries blood away from the heart?
✔✔ Artery
What structure prevents backflow of blood in veins?
✔✔ Valves
What is the role of the heart?
✔✔ Pump blood around the body
What is immunity?
✔✔ Ability to resist disease
What cells produce antibodies?
4
