
50 Biology MCQs for Competetive Exams
Biology is the study of life and living organisms, encompassing a wide range of topics from the smallest cellular processes to the complexities of entire ecosystems. Whether you’re a student preparing for exams, a teacher looking for resources, or simply a science enthusiast eager to test your knowledge, our collection of multiple-choice questions (Biology MCQs) is designed to challenge and enhance your understanding of various biological concepts.
Below, you’ll find a diverse set of 50 biology MCQs covering fundamental topics in biology such as cell biology, genetics, physiology, and ecology. Each question is crafted to not only test your knowledge but also to help you learn more about biology. Try and solve the following biology MCQs to test your knowledge of biology.
- Which molecule carries genetic information from DNA to the ribosome?
- a) tRNA
- b) rRNA
- c) mRNA
- d) siRNA
- Which process involves the division of a nucleus into two genetically identical nuclei?
- a) Meiosis
- b) Mitosis
- c) Cytokinesis
- d) Binary fission
- What is the main function of the large intestine in the digestive system?
- a) Nutrient absorption
- b) Water absorption
- c) Protein digestion
- d) Fat emulsification
- Which blood cells are primarily responsible for immune responses?
- a) Red blood cells
- b) Platelets
- c) White blood cells
- d) Plasma cells
- Which hormone regulates blood sugar levels by facilitating the uptake of glucose into cells?
- a) Glucagon
- b) Insulin
- c) Thyroxine
- d) Adrenaline
- Which structure in plants is responsible for water transport?
- a) Phloem
- b) Xylem
- c) Stomata
- d) Chloroplast
- What is the process by which plants lose water vapor through their leaves?
- a) Photosynthesis
- b) Respiration
- c) Transpiration
- d) Germination
- Which macromolecule is the main component of cell membranes?
- a) Carbohydrates
- b) Proteins
- c) Lipids
- d) Nucleic acids
- What is the function of hemoglobin in the blood?
- a) Fighting infections
- b) Clotting blood
- c) Carrying oxygen
- d) Digesting food
- Which part of the brain controls balance and coordination?
- a) Cerebrum
- b) Cerebellum
- c) Medulla oblongata
- d) Hypothalamus
- What is the term for a group of similar cells that perform a specific function?
- a) Organ
- b) Tissue
- c) Organ system
- d) Organism
- Which type of reproduction involves two parents and produces genetically diverse offspring?
- a) Asexual reproduction
- b) Sexual reproduction
- c) Binary fission
- d) Budding
- In genetics, what is a phenotype?
- a) The genetic makeup of an organism
- b) The physical appearance or trait of an organism
- c) The location of a gene on a chromosome
- d) A variant form of a gene
- What is the purpose of the polymerase chain reaction (PCR) in molecular biology?
- a) To cut DNA at specific sequences
- b) To amplify DNA sequences
- c) To sequence DNA
- d) To repair DNA
- Which enzyme is responsible for unwinding the DNA double helix during replication?
- a) DNA polymerase
- b) RNA polymerase
- c) Helicase
- d) Ligase