50 Biology MCQs for Competetive Exams (continued)
Below, you’ll find the next batch of 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.
- What is the role of chloroplasts in plant cells?
- a) Cellular respiration
- b) Protein synthesis
- c) Photosynthesis
- d) DNA replication
- Which type of RNA brings amino acids to the ribosome during translation?
- a) mRNA
- b) rRNA
- c) tRNA
- d) snRNA
- What is the term for a trait that is influenced by multiple genes?
- a) Polygenic
- b) Monogenic
- c) Epistatic
- d) Pleiotropic
- Which structure regulates the passage of substances into and out of the cell?
- a) Cell wall
- b) Cell membrane
- c) Nucleus
- d) Cytoplasm
- What is the genetic material of most viruses?
- a) DNA only
- b) RNA only
- c) Either DNA or RNA
- d) Proteins
- Which of the following is a characteristic of all living organisms?
- a) Ability to move
- b) Photosynthesis
- c) Homeostasis
- d) Multicellularity
- What is the primary role of the digestive system?
- a) Producing hormones
- b) Removing waste products
- c) Breaking down food and absorbing nutrients
- d) Circulating blood
- What is a mutation?
- a) A change in the DNA sequence
- b) A type of protein
- c) A carbohydrate molecule
- d) A lipid structure
- Which of the following best describes a virus?
- a) A living cell
- b) A single-celled organism
- c) A non-living infectious agent
- d) A type of bacteria
- Which process in plants involves the loss of water vapor through stomata?
- a) Photosynthesis
- b) Transpiration
- c) Respiration
- d) Germination
- Which cell type is involved in the formation of bones?
- a) Osteocytes
- b) Osteoblasts
- c) Osteoclasts
- d) Chondrocytes
- Which of the following is the basic unit of life?
- a) Atom
- b) Cell
- c) Molecule
- d) Organ
- What is the powerhouse of the cell?
- a) Nucleus
- b) Ribosome
- c) Mitochondrion
- d) Endoplasmic reticulum
- Which process converts glucose into energy in cells?
- a) Photosynthesis
- b) Respiration
- c) Fermentation
- d) Transpiration
- What is the main pigment involved in photosynthesis?
- a) Hemoglobin
- b) Chlorophyll
- c) Carotene
- d) Melanin
- Which organelle is responsible for protein synthesis?
- a) Lysosome
- b) Ribosome
- c) Golgi apparatus
- d) Vacuole
- DNA is made up of units called:
- a) Amino acids
- b) Nucleotides
- c) Fatty acids
- d) Monosaccharides
- In which phase of the cell cycle does DNA replication occur?
- a) G1 phase
- b) S phase
- c) G2 phase
- d) M phase
- What are the building blocks of proteins?
- a) Nucleotides
- b) Monosaccharides
- c) Amino acids
- d) Fatty acids
- Which of the following is NOT a type of RNA?
- a) mRNA
- b) rRNA
- c) tRNA
- d) dRNA
A molecular biologist and aspiring bioinformatician with a passion for genomics, rare diseases, and precision medicine. With an MPhil in Molecular Biology and experience in genetics and genomics, he has contributed to clinical research projects on rare genetic disorders. He’s passionate about making genomic data meaningful — and ultimately helpful — for patients and clinicians alike.
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