GCSE Biology Quiz Multiple Choice Questions| Practice Exam
1. Which of the following is responsible for the digestion of proteins in the human body?
A. Stomach
B. Liver
C. Small intestine
D. Pancreas
Answer: A. Stomach
2. What is the role of the mitochondria in a cell?
A. Storage of water
B. Production of energy
C. Transport of nutrients
D. Detoxification of harmful substances
Answer: B. Production of energy
3. Which of the following is a function of the ribosomes in a cell?
A. Protection of the cell
B. Control of cell division
C. Synthesis of proteins
D. Storage of genetic information
Answer: C. Synthesis of proteins
4. Which of the following is the site of photosynthesis in plant cells?
A. Mitochondria
B. Chloroplasts
C. Nucleus
D. Golgi apparatus
Answer: B. Chloroplasts
5. Which of the following is responsible for carrying oxygen in the bloodstream?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: A. Red blood cells
6. Which of the following is an example of an organ in the human body?
A. Nucleus
B. Ribosome
C. Lungs
D. Enzyme
Answer: C. Lungs
7. Which of the following is a function of the nucleus in a cell?
A. Production of energy
B. Storage of genetic information
C. Synthesis of proteins
D. Breakdown of waste materials
Answer: B. Storage of genetic information
8. What is the main function of the circulatory system in the human body?
A. Exchange of gases
B. Removal of waste products
C. Regulation of body temperature
D. Transportation of nutrients and hormones
Answer: D. Transportation of nutrients and hormones
9. Which of the following is responsible for the production of antibodies in the human body?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: B. White blood cells
10. Which of the following is an example of an infectious disease?
A. Diabetes
B. Cancer
C. Influenza
D. Asthma
Answer: C. Influenza
GCSE Biology Exam Questions and Answers pdf
11. Which of the following is the primary function of the respiratory system?
A. Production of hormones
B. Regulation of body temperature
C. Exchange of gases
D. Digestion of food
Answer: C. Exchange of gases
12. Which of the following is responsible for carrying out photosynthesis in plant cells?
A. Chlorophyll
B. Mitochondria
C. Vacuole
D. Golgi apparatus
Answer: A. Chlorophyll
13. Which of the following is a greenhouse gas that contributes to global warming?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Answer: C. Carbon dioxide
14. Which of the following is responsible for transmitting electrical signals in the nervous system?
A. Neurons
B. Red blood cells
C. Muscle cells
D. Epithelial cells
Answer: A. Neurons
15. Which of the following is the correct sequence of stages in the cell cycle?
A. G1, S, G2, M
B. G2, M, G1, S
C. S, G2, G1, M
D. M, G1, S, G2
Answer: A. G1, S, G2, M
16. Which of the following is the function of the enzyme amylase?
A. Breakdown of lipids
B. Breakdown of carbohydrates
C. Breakdown of proteins
D. Synthesis of DNA
Answer: B. Breakdown of carbohydrates
17. Which of the following is responsible for the production of sperm in males?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: C. Testes
18. Which of the following is an example of an involuntary muscle?
A. Biceps muscle
B. Quadriceps muscle
C. Cardiac muscle
D. Hamstring muscle
Answer: C. Cardiac muscle
19. Which of the following is the function of the hormone insulin in the human body?
A. Regulation of blood sugar levels
B. Regulation of body temperature
C. Production of red blood cells
D. Digestion of fats
Answer: A. Regulation of blood sugar levels
20. Which of the following is responsible for the production of eggs in females?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: A. Ovaries
21. Which of the following is the basic structural unit of all living organisms?
A. Cell
B. Tissue
C. Organ
D. Organism
Answer: A. Cell
22. Which of the following is the function of the hormone adrenaline in the human body?
A. Regulation of blood sugar levels
B. Fight-or-flight response
C. Maintenance of water balance
D. Control of body temperature
Answer: B. Fight-or-flight response
23. Which of the following is the primary function of the excretory system?
A. Exchange of gases
B. Transportation of nutrients
C. Removal of waste products
D. Regulation of body temperature
Answer: C. Removal of waste products
24. Which of the following is responsible for the production of the female sex hormone estrogen?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: A. Ovaries
25. Which of the following is the correct order of the levels of organization in the human body from simplest to most complex?
A. Organism, organ system, organ, tissue, cell
B. Cell, tissue, organ, organ system, organism
C. Organ, organism, tissue, cell, organ system
D. Tissue, cell, organ system, organ, organism
Answer: B. Cell, tissue, organ, organ system, organism
26. Which of the following is responsible for the production of the hormone testosterone in males?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: C. Testes
27. Which of the following is the function of the enzyme pepsin?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
28. Which of the following is the process by which plants convert light energy into chemical energy?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Fermentation
Answer: B. Photosynthesis
29. Which of the following is responsible for the production of the hormone melatonin?
A. Pineal gland
B. Pituitary gland
C. Thyroid gland
D. Adrenal gland
Answer: A. Pineal gland
30. Which of the following is the function of the enzyme lipase?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: B. Breakdown of lipids
31. Which of the following is the process by which water is lost from the leaves of plants?
A. Transpiration
B. Respiration
C. Photosynthesis
D. Osmosis
Answer: A. Transpiration
32. Which of the following is responsible for the production of antibodies?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: B. White blood cells
33. Which of the following is the function of the enzyme trypsin?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
34. Which of the following is the process by which plants and animals release energy from food?
A. Respiration
B. Photosynthesis
C. Digestion
D. Excretion
Answer: A. Respiration
35. Which of the following is the largest organ in the human body?
A. Heart
B. Brain
C. Skin
D. Liver
Answer: C. Skin
36. Which of the following is the process by which plants and some bacteria convert nitrogen gas into a usable form for living organisms?
A. Nitrogen fixation
B. Photosynthesis
C. Respiration
D. Transpiration
Answer: A. Nitrogen fixation
37. Which of the following is responsible for the storage of genetic information in a cell?
A. Mitochondria
B. Nucleus
C. Chloroplasts
D. Endoplasmic reticulum
Answer: B. Nucleus
38. Which of the following is the function of the enzyme amylase in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of proteins
C. Breakdown of lipids
D. Synthesis of DNA
Answer: A. Breakdown of carbohydrates
39. Which of the following is responsible for the transport of water and nutrients in a plant?
A. Xylem
B. Phloem
C. Epidermis
D. Stomata
Answer: A. Xylem
40. Which of the following is the correct sequence of levels of classification in the biological hierarchy, from broadest to most specific?
A. Kingdom, phylum, class, order, family, genus, species
B. Phylum, kingdom, class, order, family, genus, species
C. Kingdom, phylum, order, class, family, genus, species
D. Phylum, kingdom, order, class, family, genus, species
Answer: A. Kingdom, phylum, class, order, family, genus, species
41. Which of the following is the primary function of the red blood cells?
A. Transporting oxygen
B. Fighting infections
C. Forming blood clots
D. Filtering waste products
Answer: A. Transporting oxygen
42. Which of the following is responsible for the regulation of water balance in the body?
A. Kidneys
B. Liver
C. Stomach
D. Lungs
Answer: A. Kidneys
43. Which of the following is the process by which plants make their own food?
A. Respiration
B. Digestion
C. Excretion
D. Photosynthesis
Answer: D. Photosynthesis
44. Which of the following is the function of the enzyme DNA polymerase?
A. Breaking down DNA molecules
B. Synthesizing new DNA strands
C. Breaking down RNA molecules
D. Synthesizing new RNA strands
Answer: B. Synthesizing new DNA strands
45. Which of the following is responsible for the regulation of blood glucose levels?
A. Insulin
B. Glucagon
C. Melatonin
D. Estrogen
Answer: A. Insulin
46. Which of the following is responsible for the transmission of electrical signals between neurons?
A. Synapse
B. Hormone
C. Red blood cell
D. Enzyme
Answer: A. Synapse
47. Which of the following is the primary function of the large intestine?
A. Absorption of nutrients
B. Production of bile
C. Storage and elimination of waste
D. Filtration of blood
Answer: C. Storage and elimination of waste
48. Which of the following is responsible for the production of the hormone progesterone in females?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: A. Ovaries
49. Which of the following is the process by which a cell divides into two identical daughter cells?
A. Meiosis
B. Mitosis
C. Fertilization
D. Replication
Answer: B. Mitosis
50. Which of the following is responsible for the transmission of genetic information from parents to offspring?
A. RNA
B. DNA
C. Protein
D. Lipid
Answer: B. DNA
GCSE Biology Exam Questions Quiz
1. Which of the following is the site of gas exchange in the human respiratory system?
A. Bronchi
B. Alveoli
C. Trachea
D. Diaphragm
Answer: B. Alveoli
2. What is the function of the hormone insulin in the human body?
A. Regulating blood sugar levels
B. Controlling body temperature
C. Promoting growth and development
D. Regulating sleep patterns
Answer: A. Regulating blood sugar levels
3. Which of the following is the correct order of biological organization, from simplest to most complex?
A. Cell, tissue, organ, organ system, organism
B. Organism, organ system, organ, tissue, cell
C. Organ, tissue, cell, organ system, organism
D. Cell, organ system, organ, tissue, organism
Answer: A. Cell, tissue, organ, organ system, organism
4. What is the function of the enzyme amylase in the digestive system?
A. Breaking down proteins
B. Breaking down carbohydrates
C. Breaking down lipids
D. Breaking down nucleic acids
Answer: B. Breaking down carbohydrates
5. Which of the following is responsible for carrying oxygen in the bloodstream?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: A. Red blood cells
6. Which of the following is the process by which plants convert light energy into chemical energy?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Fermentation
Answer: B. Photosynthesis
7. Which of the following is responsible for the production of the hormone adrenaline?
A. Pancreas
B. Thyroid gland
C. Adrenal glands
D. Pituitary gland
Answer: C. Adrenal glands
8. Which of the following is the function of the enzyme protease in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
9. Which of the following is the primary function of the circulatory system?
A. Exchange of gases
B. Regulation of body temperature
C. Absorption of nutrients
D. Production of hormones
Answer: A. Exchange of gases
10. Which of the following is responsible for the transport of oxygen in the bloodstream?
A. White blood cells
B. Platelets
C. Red blood cells
D. Plasma
Answer: C. Red blood cells
bbc bitesize biology gcse aqa | biology past paper aqa
11. Which of the following is the function of the enzyme lipase in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: B. Breakdown of lipids
12. Which of the following is responsible for the production of the hormone oxytocin?
A. Thyroid gland
B. Pancreas
C. Pituitary gland
D. Adrenal glands
Answer: C. Pituitary gland
13. Which of the following is the process by which cells produce new individuals of the same species?
A. Fertilization
B. Mitosis
C. Meiosis
D. Replication
Answer: B. Mitosis
14. Which of the following is the primary function of the urinary system?
A. Digestion of food
B. Production of hormones
C. Removal of waste products
D. Exchange of gases
Answer: C. Removal of waste products
15. Which of the following is responsible for the transmission of genetic information from parents to offspring?
A. RNA
B. DNA
C. Protein
D. Lipid
Answer: B. DNA
16. Which of the following is responsible for the transmission of nerve impulses in the human body?
A. Neurons
B. Hormones
C. Red blood cells
D. Platelets
Answer: A. Neurons
17. Which of the following is the function of the enzyme carbohydrase in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: A. Breakdown of carbohydrates
18. Which of the following is the process by which an organism releases metabolic waste products?
A. Respiration
B. Photosynthesis
C. Excretion
D. Digestion
Answer: C. Excretion
19. Which of the following is responsible for the production of the hormone insulin?
A. Pancreas
B. Thyroid gland
C. Adrenal glands
D. Pituitary gland
Answer: A. Pancreas
20. Which of the following is the primary function of the skeletal system?
A. Protection of internal organs
B. Regulation of body temperature
C. Production of red blood cells
D. Exchange of gases
Answer: A. Protection of internal organs
21. Which of the following is responsible for the breakdown of worn-out organelles and cell debris in a cell?
A. Lysosomes
B. Mitochondria
C. Golgi apparatus
D. Endoplasmic reticulum
Answer: A. Lysosomes
22. Which of the following is the process by which cells obtain energy from glucose in the absence of oxygen?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
Answer: C. Fermentation
23. Which of the following is responsible for the production of the female sex hormone estrogen?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: A. Ovaries
24. Which of the following is the primary function of the endocrine system?
A. Regulation of body temperature
B. Coordination of body movements
C. Production of hormones
D. Exchange of gases
Answer: C. Production of hormones
25. Which of the following is responsible for the transport of water and minerals from the roots to the leaves in a plant?
A. Xylem
B. Phloem
C. Epidermis
D. Stomata
Answer: A. Xylem
26. Which of the following is the function of the enzyme pepsin in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
27. Which of the following is the process by which water moves across a semi-permeable membrane from an area of higher concentration to an area of lower concentration?
A. Osmosis
B. Diffusion
C. Active transport
D. Facilitated diffusion
Answer: A. Osmosis
28. Which of the following is responsible for the control and coordination of body activities in humans?
A. Nervous system
B. Endocrine system
C. Respiratory system
D. Circulatory system
Answer: A. Nervous system
29. Which of the following is the primary function of the reproductive system?
A. Regulation of body temperature
B. Production of hormones
C. Exchange of gases
D. Reproduction
Answer: D. Reproduction
30. Which of the following is responsible for the transport of sugars and other organic nutrients in a plant?
A. Xylem
B. Phloem
C. Epidermis
D. Stomata
Answer: B. Phloem
31. Which of the following is the process by which energy is released from glucose in the presence of oxygen?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
Answer: A. Respiration
32. Which of the following is responsible for the production of the male sex hormone testosterone?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: C. Testes
33. Which of the following is the process by which undigested food material is removed from the body?
A. Absorption
B. Assimilation
C. Egestion
D. Secretion
Answer: C. Egestion
34. Which of the following is responsible for the production of antibodies in response to foreign substances in the body?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: B. White blood cells
35. Which of the following is the correct order of the stages of mitosis?
A. Prophase, metaphase, anaphase, telophase
B. Metaphase, prophase, anaphase, telophase
C. Anaphase, prophase, metaphase, telophase
D. Telophase, anaphase, prophase, metaphase
Answer: A. Prophase, metaphase, anaphase, telophase
36. Which of the following is responsible for the release of eggs from the ovaries in females?
A. Uterus
B. Fallopian tubes
C. Cervix
D. Vagina
Answer: B. Fallopian tubes
37. Which of the following is the process by which plants lose water vapor through small openings on their leaves?
A. Osmosis
B. Transpiration
C. Diffusion
D. Active transport
Answer: B. Transpiration
38. Which of the following is the function of the enzyme DNA helicase during DNA replication?
A. Breaking down DNA molecules
B. Synthesizing new DNA strands
C. Breaking down RNA molecules
D. Unwinding the DNA double helix
Answer: D. Unwinding the DNA double helix
39. Which of the following is responsible for the regulation of blood pressure in the human body?
A. Adrenal glands
B. Thyroid gland
C. Pituitary gland
D. Kidneys
Answer: D. Kidneys
40. Which of the following is the process by which plants respond to light by growing towards it?
A. Phototropism
B. Gravitropism
C. Hydrotropism
D. Thigmotropism
Answer: A. Phototropism
41. Which of the following is responsible for the breakdown of toxins and drugs in the liver?
A. Pancreas
B. Gallbladder
C. Kidneys
D. Enzymes
Answer: D. Enzymes
42. Which of the following is the process by which water molecules move across a cell membrane from an area of lower solute concentration to an area of higher solute concentration?
A. Osmosis
B. Diffusion
C. Active transport
D. Facilitated diffusion
Answer: C. Active transport
43. Which of the following is responsible for the regulation of body temperature in humans?
A. Nervous system
B. Endocrine system
C. Respiratory system
D. Circulatory system
Answer: D. Circulatory system
44. Which of the following is the primary function of the ribosomes in a cell?
A. Production of energy
B. Synthesis of proteins
C. Storage of genetic information
D. Control of cell division
Answer: B. Synthesis of proteins
45. Which of the following is responsible for the transmission of genetic traits from parents to offspring?
A. Nucleus
B. Cytoplasm
C. Mitochondria
D. Genes
Answer: D. Genes
46. Which of the following is responsible for the production of the hormone melatonin?
A. Pituitary gland
B. Thyroid gland
C. Adrenal glands
D. Pineal gland
Answer: D. Pineal gland
47. Which of the following is the process by which plants convert nitrates in the soil into proteins?
A. Photosynthesis
B. Transpiration
C. Respiration
D. Nitrogen fixation
Answer: D. Nitrogen fixation
48. Which of the following is the function of the enzyme amylase in the mouth during digestion?
A. Breakdown of proteins
B. Breakdown of carbohydrates
C. Breakdown of lipids
D. Breakdown of nucleic acids
Answer: B. Breakdown of carbohydrates
49. Which of the following is responsible for the production of the hormone progesterone?
A. Ovaries
B. Uterus
C. Testes
D. Fallopian tubes
Answer: A. Ovaries
50. Which of the following is the process by which plants convert nitrites into nitrates in the soil?
A. Denitrification
B. Nitrification
C. Ammonification
D. Nitrogen assimilation
Answer: B. Nitrification
1. Which of the following is the primary function of the respiratory system in humans?
A. Transport of oxygen
B. Regulation of body temperature
C. Production of hormones
D. Digestion of food
Answer: A. Transport of oxygen
2. Which of the following is responsible for the production of the hormone insulin in the human body?
A. Pancreas
B. Thyroid gland
C. Adrenal glands
D. Pituitary gland
Answer: A. Pancreas
3. Which of the following is the process by which organisms break down glucose to release energy in the presence of oxygen?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
Answer: A. Respiration
4. Which of the following is responsible for the transport of oxygen in the bloodstream?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Answer: A. Red blood cells
5. Which of the following is the primary function of the nervous system?
A. Regulation of body temperature
B. Control and coordination of body activities
C. Production of hormones
D. Exchange of gases
Answer: B. Control and coordination of body activities
6. Which of the following is responsible for the production of sperm cells in males?
A. Testes
B. Ovaries
C. Uterus
D. Fallopian tubes
Answer: A. Testes
7. Which of the following is the process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
Answer: B. Photosynthesis
8. Which of the following is responsible for the regulation of water and electrolyte balance in the human body?
A. Kidneys
B. Liver
C. Stomach
D. Lungs
Answer: A. Kidneys
9. Which of the following is the function of the enzyme trypsin in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
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10. Which of the following is responsible for the transmission of genetic information from parents to offspring?
A. DNA
B. RNA
C. Protein
D. Lipid
Answer: A. DNA
11. Which of the following is the process by which organisms produce offspring that are genetically identical to themselves?
A. Fertilization
B. Mitosis
C. Meiosis
D. Replication
Answer: B. Mitosis
12. Which of the following is responsible for the production of the hormone adrenaline in response to stress or danger?
A. Pancreas
B. Thyroid gland
C. Adrenal glands
D. Pituitary gland
Answer: C. Adrenal glands
13. Which of the following is the primary function of the circulatory system in humans?
A. Exchange of gases
B. Regulation of body temperature
C. Absorption of nutrients
D. Production of hormones
Answer: A. Exchange of gases
14. Which of the following is responsible for the breakdown of old red blood cells and recycling of their components?
A. Lymph nodes
B. Spleen
C. Tonsils
D. Liver
Answer: B. Spleen
15. Which of the following is the process by which a single fertilized egg cell develops into a multicellular organism?
A. Cell division
B. Cell differentiation
C. Embryogenesis
D. Organogenesis
Answer: C. Embryogenesis
16. Which of the following is the process by which plants convert light energy into chemical energy in the form of glucose?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
Answer: B. Photosynthesis
17. Which of the following is responsible for the production of the hormone estrogen in females?
A. Ovaries
B. Testes
C. Adrenal glands
D. Pineal gland
Answer: A. Ovaries
18. Which of the following is the process by which a sperm cell fuses with an egg cell to form a zygote?
A. Fertilization
B. Implantation
C. Replication
D. Ovulation
Answer: A. Fertilization
19. Which of the following is responsible for the transmission of nerve impulses between neurons?
A. Hormones
B. Neurotransmitters
C. Enzymes
D. Red blood cells
Answer: B. Neurotransmitters
20. Which of the following is the function of the enzyme lipase in the digestive system?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: B. Breakdown of lipids
21. Which of the following is responsible for the transport of nutrients and waste products in a plant?
A. Xylem
B. Phloem
C. Epidermis
D. Stomata
Answer: B. Phloem
22. Which of the following is the process by which plants respond to gravity by growing in the direction of gravity?
A. Phototropism
B. Gravitropism
C. Hydrotropism
D. Thigmotropism
Answer: B. Gravitropism
23. Which of the following is responsible for the production of the hormone growth hormone (GH)?
A. Pituitary gland
B. Thyroid gland
C. Adrenal glands
D. Pancreas
Answer: A. Pituitary gland
24. Which of the following is the process by which genetic information is transferred from DNA to mRNA?
A. Transcription
B. Translation
C. Replication
D. Transformation
Answer: A. Transcription
25. Which of the following is responsible for the elimination of waste products from the human body?
A. Lungs
B. Skin
C. Liver
D. Kidneys
Answer: D. Kidneys
26. Which of the following is responsible for the production of the hormone testosterone in males?
A. Testes
B. Ovaries
C. Adrenal glands
D. Thyroid gland
Answer: A. Testes
27. Which of the following is the process by which plants release excess water vapor through their stomata?
A. Osmosis
B. Transpiration
C. Diffusion
D. Active transport
Answer: B. Transpiration
28. Which of the following is responsible for the regulation of blood sugar levels in the human body?
A. Pancreas
B. Gallbladder
C. Spleen
D. Esophagus
Answer: A. Pancreas
29. Which of the following is the function of the enzyme pepsin in the stomach during digestion?
A. Breakdown of carbohydrates
B. Breakdown of lipids
C. Breakdown of proteins
D. Synthesis of DNA
Answer: C. Breakdown of proteins
30. Which of the following is responsible for the regulation of the sleep-wake cycle and other daily rhythms in humans?
A. Pineal gland
B. Thyroid gland
C. Adrenal glands
D. Pituitary gland
Answer: A. Pineal gland