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 4 of 7
- A. Escherichia coli
- B. Proteus mirabilis
- C. Agrobacterium tumerfaciens
- D. Ralstonia solanacearum
Explanation: Transgenic plants such as golden rice are produced primarily with the help of Agrobacterium tumefaciens.
Correct answer: Agrobacterium tumerfaciens- A. Formalin
- B. Glutaraldehyde
- C. Ethylene Oxide
- D. Iodine
Explanation: Formalin is a solution of formaldehyde in water. It is the most common preservative used for biological specimens, as it is effective and…
Correct answer: Formalin- A. Human hand: Bat's wing
- B. Bat's wing: Wings of butterfly
- C. Horse front leg: Front flappers of Whale
- D. Forelimb of a cat: Forelimb of a whale.
Explanation: The wings of a bat and the wings of a butterfly are analogous structures, but not homologous.
Correct answer: Bat's wing: Wings of butterfly- A. Ecosystem - Organisms of the same species
- B. Habitat - The layer of the Earth's atmosphere
- C. Niche - A large, distinct ecosystem
- D. Biosphere - Where life exists
Explanation: The biosphere is the part of the Earth that supports life, including the atmosphere, hydrosphere (water), and lithosphere (land).
Correct answer: Biosphere - Where life exists- A. Taking antihistamines
- B. Getting vaccinated
- C. Applying antiseptics
- D. Taking antibiotics
Explanation: Vaccination is a highly effective way to prevent viral infections by:1.
Correct answer: Getting vaccinated- A. Natural passive immunity
- B. Natural active immunity
- C. Acquired active immunity
- D. Acquired passive immunity
Explanation: Vaccines are antigens injected into the body (artificially) but our body cells are the ones producing antibodies.
Correct answer: Acquired active immunity- A. Cartilage
- B. Epithelium
- C. Muscle
- D. Nerve
Explanation: Cartilage is a connective tissue that is composed of cells called chondrocytes and an extracellular matrix that contains collagen and…
Correct answer: Cartilage- A. Pulmonary tuberculosis
- B. Typhoid
- C. Cholera
- D. Pneumonia
Explanation: The BCG (Bacillis Calmette-Guerin) vaccine is primarily used to prevent tuberculosis, a bacterial infection that primarily affects the…
Correct answer: Pulmonary tuberculosis- A. Snake's legs
- B. Shedding of milk teeth
- C. Muscle atrophy
- D. Movement of ear
Explanation: Shedding of milk teeth is a natural process that occurs as part of normal development, not a result of disuse of organs.
Correct answer: Shedding of milk teeth- A. Marine Biology
- B. Parasitology
- C. Environmental Biology
- D. Microbiology
Explanation: The correct answer is Environmental Biology because it specifically examines how living organisms interact with their environment…
Correct answer: Environmental Biology- A. Biodiversity
- B. Phyletic lineage
- C. Science
- D. Fossil
Explanation: The correct answer is 'phyletic lineage.' This term refers to the evolutionary history and development of a species or group of organisms.
Correct answer: Phyletic lineage- A. Religion
- B. Philosophy
- C. Science
- D. Imagination
Explanation: This question tests understanding of scientific methodology, relevant for medical students in biochemistry and related fields.
Correct answer: Science- A. Biology
- B. Physics
- C. Chemistry
- D. Science
Explanation: The correct answer is science because it is the broader field that encompasses all the other disciplines listed-biology, physics, and…
Correct answer: Science- A. Experiments can prove it true or false
- B. It can be converted into a theory or a law
- C. It is less explanatory than a theory or law
- D. It is always a religious idea
Explanation: The correct answer is Option D: A hypothesis is not always a religious idea.
Correct answer: It is always a religious idea- A. It moves from general to specific
- B. It draws specific conclusions from some general principle
- C. It is used to devise a hypothesis
- D. All of these
Explanation: Deductive reasoning is a logical process where conclusions are drawn from a set of premises that are generally assumed to be true.
Correct answer: All of these- A. Inductive reasoning
- B. Intuition
- C. Esthetic preference
- D. All of these
Explanation: The correct answer is all of these. Hypotheses can be formed through various methods, including deductive reasoning, which involves…
Correct answer: All of these- A. Intuition
- B. Aesthetic preference
- C. Comparison and analogy with other processes
- D. All of these
Explanation: The correct answer is Option D: 'All of these.' In scientific research, forming a hypothesis is not solely based on one method or…
Correct answer: All of these- A. Theory
- B. Hypothesis
- C. Law
- D. Deduction
Explanation: The correct answer is hypothesis. A hypothesis is a proposed explanation for an observation, which can be tested through experimentation…
Correct answer: Hypothesis- A. Deduction
- B. Theory
- C. Scientific Law
- D. All these
Explanation: The correct answer is "theory." "In science, a theory is a comprehensive explanation of some aspect of the natural world that is supported…
Correct answer: Theory- A. Biology
- B. Physics
- C. Chemistry
- D. All of these
Explanation: The correct answer is biology. Biology is the study of living organisms, which are inherently complex and diverse, making it challenging…
Correct answer: Biology