Biology MDCAT MCQs
Cell biology, genetics & physiology MCQs
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Answer: In ABO blood groups, both A and B alleles are equally expressed in type AB individuals.
Answer: Chlorophyll absorbs primarily red and blue light, reflecting green light.
Answer: Punnett squares predict the probability of offspring genotypes from parental crosses.
Answer: Pili (fimbriae) are hair-like appendages that help bacteria attach to surfaces and other cells.
Answer: Dog breeding is human-directed artificial selection for desired traits.
Answer: Charles Darwin proposed natural selection as the mechanism of evolution in On the Origin of Species.
Answer: The Human Genome Project estimated approximately 20,000-25,000 protein-coding genes.
Answer: Meiosis introduces variation through crossing over and independent assortment of chromosomes.
Answer: Hardy-Weinberg equilibrium is maintained only in the absence of all evolutionary forces.
Answer: Hemoglobin in RBCs binds oxygen in the lungs and releases it at the tissues.
Answer: Homologous structures indicate common ancestry and divergent evolution from a shared ancestor.
Answer: Photosynthesis uses light energy, CO2, and water to produce glucose and oxygen.
Answer: E. coli is a bacterium, which is a prokaryote lacking a membrane-bound nucleus.
Answer: Erythrocytes are red blood cells, not white blood cells.
Answer: Penicillin inhibits transpeptidase, preventing cross-linking of peptidoglycan in bacterial cell walls.
Answer: Most sex-linked traits are carried on the X chromosome, which is why they affect males more.
Answer: Natural selection favors individuals with traits that improve survival and reproduction.
Answer: The cohesion-tension theory explains that water is pulled up by transpiration and held together by cohesion.
Answer: Mitochondria have their own circular DNA, supporting the endosymbiotic theory of evolution.
Answer: Ball and socket joints (like the shoulder and hip) allow movement in all directions.