POST UTME COAL CITY UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of evolutionary bio\logy, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 2
A 2.5 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. If 1.8 g of CO2 and 0.5 g of H2O are produced, what is the empirical formula of the compound?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 3
A 50 g sample of a subs\tance is dissolved in 100 mL of water. If the concentration of the solution is 0.5 M, what is the molarity of the solution?
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 4
In a solution of 0.1 M glu\cose, what is the concentration of glu\cose in a 5 mL sample?
A. 0.005 M
B. 0.01 M
C. 0.05 M
D. 0.1 M
Question 5
A 100 mL sample of a 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 6
In a eukaryotic cell, the process of mitosis involves the replication of DNA and the subsequent division of the cell into two daughter cells. Which of the following stages of mitosis is characterized by the condensation of chromatin into visible chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 7
In a study on the eco\logy of a freshwater lake, researchers observed a significant increase in the population of a particular species of fish. However, the population of a competing species of fish decreased. Which of the following best explains this phenomenon?
A. Predation by a common predator
B. Competition for resources
C. Habitat modification
D. Evolutionary adaptation
Question 8
The process of evolution in a population of organisms is influenced by various factors, including genetic variation, mutation, and gene flow. Which of the following is an example of a mechanism of evolution that involves the change in the frequency of a particular trait in a population?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 9
The e\cosystem of a coral reef is characterized by a diverse array of species that interact with each other in complex ways. Which of the following is an example of a symbiotic relationship in a coral reef e\cosystem?
A. Predation
B. Competition
C. Mutualism
D. Commensalism
Question 10
A 50 g sample of a mixture of NaCl and KCl is analyzed by flame photometry. If the concentration of Na+ is 0.05 M and the concentration of K+ is 0.03 M, what is the mass of NaCl in the sample?
A. 10 g
B. 20 g
C. 30 g
D. 40 g
Question 11
A researcher is studying the structure of a protein. The protein has a specific binding site for a ligand. Which of the following types of bonds is most likely to be involved in this interaction?
A. Hydrogen bond
B. Ionic bond
C. Covalent bond
D. Van der Waals bond
Question 12
A 2.0 L sample of a gas at 27°C is collected over water at 25°C. The vapor pressure of water at 25°C is 3.0 kPa. If the total pressure of the gas is 4.0 kPa, what is the partial pressure of the gas?
A. 1.0 kPa
B. 2.0 kPa
C. 3.0 kPa
D. 4.0 kPa
Question 13
In a population of 1000 individuals, 20% have the genotype 'AA', 60% have the genotype 'Aa', and 20% have the genotype 'aa'. What is the frequency of the 'a' allele?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 14
A 10 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 15
A diagram of the human circulatory system is shown below. What is the function of the structure labeled 'B'?
A. To pump blood to the lungs
B. To carry oxygenated blood to the body
C. To regulate blood pressure
D. To produce blood cells

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