50 Biology MCQs on Introductory Topics for Competetive Exams
Read Now: The Science of Aging: Can We Live Forever?
- Which of the following is a function of the cell membrane?
a) Photosynthesis
b) Transport of materials
c) Gene expression
d) Both b and c - The primary function of the ribosome in a cell is to:
a) Synthesize proteins
b) Store genetic information
c) Provide energy for the cell
d) Breakdown macromolecules - The transfer of energy from one organism to another in an ecosystem is known as:
a) The carbon cycle
b) The nitrogen cycle
c) The water cycle
d) The food chain - The process by which an organism breaks down glucose to release energy is called:
a) Photosynthesis
b) Glycolysis
c) Respiration
d) Fermentation - Mendel’s law of dominance states that:
a) Recessive alleles are always expressed
b) Dominant alleles are always expressed
c) Alleles are inherited independently
d) Alleles segregate during gamete formation - Which of the following is NOT a source of genetic variation?
a) Mutation
b) Genetic recombination
c) Gene flow
d) Lamarckian inheritance - The theory that states that new species arise through the gradual accumulation of small, beneficial changes is known as:
a) Catastrophism
b) Punctuated equilibrium
c) Gradualism
d) Creationism - The process by which an organism adjusts to changes in its environment is called:
a) Homeostasis
b) Adaptation
c) Acclimation
d) Both a and b - The study of the relationship between organisms and their environment is known as:
a) Ecology
b) Ethology
c) Taxonomy
d) Physiology - The principle that states that all living things are composed of one or more cells is known as:
a) The cell theory
b) The germ theory
c) The theory of evolution
d) The law of biogenesis
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.