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.
Last updated
Read the Introduction to Biology notesFree MDCAT chapter notes with key terms123 questions · page 6 of 7
- A. Oxygen
- B. Carbon
- C. Nitrogen
- D. Phosphorus
Explanation: The correct answer is phosphorus. Phosphorus accounts for about 1% of the human body and plays a crucial role in forming bones, DNA, and…
Correct answer: Phosphorus- A. Social Biology
- B. Biotechnology
- C. Molecular Biology
- D. Microbiology
Explanation: The correct answer is biotechnology because it involves the use of living systems and organisms to develop or make products, such as the…
Correct answer: Biotechnology- A. Biotechnology
- B. Social Biology
- C. Human Biology
- D. Parasitology
Explanation: The correct answer is biotechnology. Biotechnology is a field that utilizes biological processes, organisms, or systems to create products…
Correct answer: Biotechnology- A. Geography
- B. Evolution
- C. Paleontology
- D. Genetics
Explanation: The correct answer is geography. Geography is primarily concerned with the study of the Earth, its features, and the human societies…
Correct answer: Geography- A. Can acquire and use energy
- B. Cannot maintain a fairly constant internal environment
- C. Contain genetic characteristics
- D. Adjust to changes in their environment
Explanation: Living things maintain a stable internal condition (homeostasis), such as body temperature or water balance.
Correct answer: Cannot maintain a fairly constant internal environment- A. Community
- B. Tissue
- C. Population
- D. Organ
Explanation: A group of organisms of the same species living together in a given area.
Correct answer: Population- A. Community
- B. Ecosystem
- C. Population
- D. Biosphere
Explanation: A population is a group of individuals of the same species living in a defined area at a given time.
Correct answer: Population- A. Water
- B. Starch
- C. Carbon
- D. Oxygen
Explanation: Water is a very small molecule, has a low molecular mass, and is inorganic.
Correct answer: Water109. The unit of life is:
- A. An organelle
- B. Atom
- C. Subatomic particle
- D. Cell
Explanation: The correct answer is "cell," as cells are the fundamental units of life that compose all living organisms.
Correct answer: Cell- A. Spleen → Leucocyte → Mitochondria → Adenine
- B. Mitochondria → Spleen → Leucocyte → Adenine
- C. Mitochondria → Adenine → Leucocyte → Spleen
- D. Spleen → Leucocyte → Adenine → Mitochondria
Explanation: The correct order of biological organization from complex to simple is: Spleen → Leucocyte → Mitochondria → Adenine.
Correct answer: Spleen → Leucocyte → Mitochondria → Adenine- A. Fresh water biology
- B. Molecular biology
- C. Marine biology
- D. Parasitology
Explanation: The correct answer is marine biology. This field focuses on the study of life forms in the ocean, which directly aligns with the discovery…
Correct answer: Marine biology- A. Sociobiology
- B. Bioclimatology
- C. Marine biology
- D. Freshwater biology
Explanation: The correct answer is bioclimatology because it focuses on the interactions between the biosphere and climatic conditions, making it…
Correct answer: Bioclimatology- A. II only
- B. III only
- C. I and II
- D. I and III
Explanation: In deductive reasoning, a specific conclusion is drawn from general statements or premises.
Correct answer: III only- A. Taxonomy
- B. Ecology
- C. Morphology
- D. Physiology
Explanation: Taxonomy is the branch of biology that deals with the classification, naming, and identification of organisms.
Correct answer: Taxonomy- A. They provide a beautiful area for recreation
- B. One can observe tropical plants there
- C. They allow ex-situ conservation of germplasm
- D. They provide a natural habitat for wildlife
Explanation: Ex-situ conservation means "off-site conservation." It is the process of protecting endangered species of plants and animals by removing…
Correct answer: They allow ex-situ conservation of germplasm- A. Skin
- B. Liver
- C. Large intestine
- D. Both A and B
Explanation: Skin covers our entire body hence has the largest surface area out of all the organs.
Correct answer: Skin- A. A.V. Leeuwenhoek
- B. Pasteur
- C. Hans
- D. Janssen
Explanation: The first compound microscopes date to 1590, but it was the Dutch Antony Van Leeuwenhoek in the mid-seventeenth century who first used…
Correct answer: A.V. Leeuwenhoek- A. Multicellular organisms
- B. Biosphere
- C. Species
- D. Population
Explanation: Option A is correct since Multicellular organism level is the lowest that consist only one organism.Option B is incorrect because…
Correct answer: Multicellular organisms- A. Organ
- B. Organelle
- C. Organ system
- D. Whole organism
Explanation: An organ is defined as a collection of tissues, which combine to form a functional unit within the body, specialized at carrying out a…
Correct answer: Organ- A. Evolution
- B. Paleontology
- C. Zoogeography
- D. Biodiversity
Explanation: Palaeontology is the study of prehistoric life on Earth using geological methods such as studying preserved remains of an organism in a…
Correct answer: Paleontology