POST UTME COAL CITY UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
The process of protein synthesis in cells involves the translation of mRNA into a polypeptide chain. Which of the following is a type of mutation that involves the substitution of one amino acid for another in the polypeptide chain?
A. Frameshift Mutation
B. Point Mutation
C. Insertion Mutation
D. Deletion Mutation
Question 3
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 4
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 5
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 6
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 7
A patient is diagnosed with a bacterial infection. The bacteria are resis\tant to multiple antibiotics. Which of the following is the most likely explanation for this resis\tance?
A. Horizontal gene transfer
B. Vertical gene transfer
C. Mutation
D. Gene editing
Question 8
The process of osmoregulation in cells involves the regulation of the concentration of solutes in the cell to maintain proper cellular function. Which of the following is an example of a mechanism of osmoregulation that involves the movement of water into or out of the cell?
A. Osmosis
B. Diffusion
C. Active Transport
D. Passive Transport
Question 9
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?
A. 1000
B. 2000
C. 4000
D. 8000
Question 10
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 11
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH
Question 12
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic, 10% are resis\tant, and the remaining 10% are intermediate. If 100 bacteria are exposed to the antibiotic, how many will be killed?
A. 80
B. 90
C. 100
D. 120
Question 13
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 14
A plant is placed in a sealed container with a limited supply of oxygen. Which of the following processes will be affected first?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis
Question 15
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

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