521. Practice check: In basic biology, which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ A. O negative
a: O negative | b: B negative | c: AB positive | d: A positive Read more
Biology MCQs – Page 27
522. Practice check: In basic biology, which organ filters blood to produce urine?
✅ C. Kidney
a: Lung | b: Stomach | c: Kidney | d: Pancreas Read more
523. Practice check: In basic biology, which molecule carries hereditary information in most organisms?
✅ A. DNA
a: DNA | b: ATP | c: Glucose | d: Cellulose Read more
524. Practice check: In basic biology, which organelle is often called the powerhouse of the cell?
✅ C. Mitochondrion
a: Lysosome | b: Ribosome | c: Mitochondrion | d: Golgi apparatus Read more
525. Practice check: In basic biology, what is the basic structural and functional unit of life?
✅ C. Cell
a: Organ | b: Tissue | c: Cell | d: Organ system Read more
526. Choose the correct biology answer: which gas is released by plants during photosynthesis?
✅ A. Oxygen
a: Oxygen | b: Carbon monoxide | c: Methane | d: Ammonia Read more
527. Choose the correct biology answer: which plant tissue transports sugars?
✅ C. Phloem
a: Cuticle | b: Xylem | c: Phloem | d: Stomata Read more
528. Choose the correct biology answer: which process reduces chromosome number to form gametes?
✅ C. Meiosis
a: Mitosis | b: Budding | c: Meiosis | d: Binary fission Read more
529. Choose the correct biology answer: which plant tissue transports water upward?
✅ A. Xylem
a: Xylem | b: Epidermis | c: Cortex only | d: Phloem Read more
530. Choose the correct biology answer: which part of the eye controls the amount of light entering?
✅ A. Iris
a: Iris | b: Cornea only | c: Retina | d: Optic nerve Read more
531. Choose the correct biology answer: which blood component helps form clots?
✅ C. Platelets
a: Red blood cells | b: Alveoli | c: Platelets | d: Neurons Read more
532. Choose the correct biology answer: what is the largest organ of the human body?
✅ C. Skin
a: Liver | b: Brain | c: Skin | d: Lung Read more
533. Choose the correct biology answer: which structure controls what enters and leaves a cell?
✅ A. Cell membrane
a: Cell membrane | b: Chromosome | c: Cell wall only | d: Nucleolus Read more
534. Choose the correct biology answer: which molecule is the main immediate energy currency of cells?
✅ B. ATP
a: Starch | b: ATP | c: DNA | d: RNA Read more
535. Choose the correct biology answer: what is the study of insects called?
✅ A. Entomology
a: Entomology | b: Herpetology | c: Botany | d: Mycology Read more
536. Choose the correct biology answer: which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Decomposers only | b: Predators | c: Producers | d: Primary consumers Read more
537. Choose the correct biology answer: what is the study of fungi called?
✅ A. Mycology
a: Mycology | b: Entomology | c: Ecology | d: Ornithology Read more
538. Choose the correct biology answer: which part of the brain helps coordinate balance and movement?
✅ D. Cerebellum
a: Pituitary gland | b: Medulla only | c: Hypothalamus | d: Cerebellum Read more
539. Choose the correct biology answer: which organ produces insulin?
✅ A. Pancreas
a: Pancreas | b: Thyroid | c: Gallbladder | d: Spleen Read more
540. Choose the correct biology answer: which biological process produces two genetically similar daughter cells for growth?
✅ D. Mitosis
a: Fertilization | b: Meiosis | c: Transcription | d: Mitosis Read more