Free Introduction to Biology MCQs with Answers
123 Introduction to Biology MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biology is divided into fields such as botany, zoology, microbiology, genetics, ecology, physiology and biotechnology, each focusing on a different aspect of life. Levels of biological organization progress from atoms and molecules through organelles, cells, tissues, organs and organ systems to organisms, populations, communities, ecosystems and the biosphere.
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Read the Introduction to Biology notesFree MDCAT chapter notes with key terms123 questions · page 3 of 7
- A. Protozoa
- B. Algae & Fungi
- C. Prokaryotes
- D. All of these
Explanation: Approximately 9.4% of known species are comprised of Protozoa, Algae & Fungi, and Prokaryotes combined, representing a significant portion…
Correct answer: All of these- A. Social Biology
- B. Biotechnology
- C. Molecular Biology
- D. Microbiology
Explanation: Biotechnology involves using living organisms or their systems to develop or make products, including the production of insulin for…
Correct answer: Biotechnology- A. A uniform or constant fact of nature
- B. Virtually irrefutable theory
- C. A theory continuously supported by experimental evidence
- D. All above statement are true
Explanation: This question tests understanding of scientific terminology, essential for medical students in biochemistry and related sciences.
Correct answer: All above statement are true- A. Mutagens
- B. Cloning
- C. Biological Control
- D. None
Explanation: Biological control involves the use of natural organisms or processes to reduce or eliminate toxicity caused by chemicals like fungicides…
Correct answer: Biological Control- A. Genetic engineering
- B. Bioremediation
- C. Hydroponic culture
- D. Chemotherapy
Explanation: Hydroponic culture is a technique where plants are grown in a nutrient-rich water solution, making it ideal for studying their nutrient…
Correct answer: Hydroponic culture- A. Gene therapy
- B. Immunization
- C. Pasteurization
- D. Preventive measure
Explanation: Pasteurization is a process that heats milk to a specific temperature for a set period to kill harmful bacteria, thus preserving the milk.
Correct answer: Pasteurization47. In Chemotherapy:
- A. Cancerous parts are exposed to short-wave radiation
- B. Administering certain anti-cancerous chemicals to the patient
- C. Gene therapy
- D. All of these
Explanation: Chemotherapy is a treatment method that utilizes chemical substances, particularly anti-cancer drugs, to kill or inhibit the growth of…
Correct answer: Administering certain anti-cancerous chemicals to the patient- A. Gene therapy
- B. Integrated disease management
- C. Bioremediation
- D. Cloning
Explanation: The correct answer is gene therapy. This technique involves altering the genes inside a person's cells to treat or stop disease, directly…
Correct answer: Gene therapy- A. Radiotherapy
- B. Chemotherapy
- C. Gene therapy
- D. Antibiotics
Explanation: Antibiotics are designed to treat bacterial infections and are not effective against cancer cells.
Correct answer: Antibiotics- A. Multiple copies of the desired genotype
- B. Used to produce genetically identical cattle
- C. Commercial production of valuable animals
- D. All of these
Explanation: Cloning technology allows for the creation of multiple copies of a desired genotype, which is essential in various fields such as…
Correct answer: All of these- A. Eugenic initiatives
- B. Bioremediation techniques
- C. Gene therapy strategies
- D. Integrated disease management program
Explanation: Integrated disease management programs employ a holistic approach combining multiple strategies to control and eliminate diseases on a…
Correct answer: Integrated disease management program- A. Sterilization
- B. Boiling
- C. Radiation
- D. Antiseptics
Explanation: Boiling, radiation, and sterilization are physical methods of controlling bacteria, whereas antiseptics are chemical agents, not physical…
Correct answer: Antiseptics- A. Morphology
- B. Cytology
- C. Histology
- D. Anatomy
Explanation: Cytology (cell biology) is the study of the structure, function, and behavior of cells.
Correct answer: Cytology- A. Ecology
- B. Taxonomy
- C. Embryology
- D. Physiology
Explanation: Ecology focuses on how organisms interact with each other and with their surroundings.
Correct answer: Ecology- A. Paleontology
- B. Genetics
- C. Evolution
- D. Taxonomy
Explanation: Genetics studies how traits are passed from parents to offspring and the variation among organisms.
Correct answer: Genetics- A. Taxonomy
- B. Morphology
- C. Anatomy
- D. Physiology
Explanation: Taxonomy organizes organisms into groups based on similarities and evolutionary relationships.
Correct answer: Taxonomy- A. Xylem tissue
- B. Stomach
- C. Stem
- D. Mesenchyme
Explanation: The stem is an organ in plants. In plants, organs include roots, stems, and leaves.
Correct answer: Stem- A. Biosphere
- B. Ecosystem
- C. Community
- D. Habitat
Explanation: The biosphere is made up of the parts of Earth where life exists. The biosphere extends from the deepest root systems of trees to the dark…
Correct answer: Biosphere- A. Diamond
- B. Emerald
- C. Ruby
- D. Marjan
Explanation: Red coral by the name of 'MARJAN' is used by Hakeems in preparing eastern medicines.
Correct answer: Marjan- A. Mineral nutrition
- B. Parasitic nutrition
- C. Saprophytic nutrition
- D. Symbiotic nutrition
Explanation: Feeding by living in or on another organism (host) belonging to a different species is called **parasitic nutrition** (Option B).
Correct answer: Parasitic nutrition