MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: C. Substances with similar polarity tend to dissolve one another
Explanation:
Polar solvents favor polar or ionic solutes.
Nonpolar solvents favor nonpolar solutes.
Choose an option to check your answer.
Correct Answer: D. Having two different alleles at a locus
Explanation:
A heterozygote carries two allele forms.
Its phenotype depends on their interaction.
Choose an option to check your answer.
Correct Answer: D. A mixture with dispersed particles intermediate between solution and suspension size
Explanation:
Colloidal particles remain dispersed for long periods.
They can scatter light through the Tyndall effect.
Choose an option to check your answer.
Correct Answer: A. Having two different alleles at a locus
Explanation:
A heterozygote carries two allele forms.
Its phenotype depends on their interaction.
Choose an option to check your answer.
Correct Answer: A. Scattering of light by colloidal particles
Explanation:
True solutions generally do not show visible light scattering.
Colloids make a light beam visible.
Choose an option to check your answer.
Correct Answer: B. The two alleles of a gene separate during gamete formation
Explanation:
Each gamete receives one allele from a pair.
Fertilization restores the pair.
Choose an option to check your answer.
Correct Answer: B. 2.0 L
Explanation:
Use P1V1=P2V2.
V2=100×4.0/200 = 2.0 L.
Choose an option to check your answer.
Correct Answer: C. The two alleles of a gene separate during gamete formation
Explanation:
Each gamete receives one allele from a pair.
Fertilization restores the pair.
Choose an option to check your answer.
Correct Answer: C. 3.0 L
Explanation:
Use V1/T1=V2/T2.
V2=2.0×450/300 = 3.0 L.
Choose an option to check your answer.
Correct Answer: D. RNA carrying coding information from DNA to ribosomes
Explanation:
MRNA contains codons specifying amino-acid sequence.
It is translated by ribosomes.
Choose an option to check your answer.
Correct Answer: D. AUG
Explanation:
AUG codes for methionine and usually serves as the start codon.
It establishes the reading frame.
Choose an option to check your answer.
Correct Answer: D. Observable characteristics of an organism
Explanation:
Phenotype includes structural, biochemical, and behavioral traits.
It is influenced by genes and environment.
