POST UTME CALEB UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Active transport of ions across the renal tubular epithelium
B. Passive diffusion of ions through the renal tubular epithelium
C. Excretion of excess ions in the urine
D. Reabsorption of ions from the filtrate
Question 2
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If 1.5 mol of the gas is added to the flask, what is the new pressure?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 3
A cell is in the process of undergoing mitosis. Which of the following stages is characterized by the condensation of chromatin into visible chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 4
A 2.5-g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 2.5 liters at 25°C and 1 atm. What is the empirical formula of the compound?
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 5
In a population of 1000 Drosophila melanogaster, 200 exhibit the recessive trait 'curled wings'. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 6
A population of bacteria is growing exponentially. What is the rate of growth of the population?
A. The rate of growth is cons\tant
B. The rate of growth is proportional to the size of the population
C. The rate of growth is inversely proportional to the size of the population
D. The rate of growth is zero
Question 7
A population of rabbits is growing according to the \logistic growth equation. If the initial population is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population after 5 years?
A. 500
B. 600
C. 700
D. 800
Question 8
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
A researcher is studying the effects of a new medication on the nervous system. Which of the following neurotransmitters is responsible for regulating muscle contraction?
A. Acetylcholine
B. Dopamine
C. Serotonin
D. GABA
Question 10
What is the primary function of the Golgi apparatus in a cell?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Modification and packaging of proteins and lipids
Question 11
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To synthesize proteins
D. To store genetic information
Question 12
A cell is placed in a medium with a concentration of 0.1 M glu\cose. If the cell has a glu\cose uptake rate of 0.01 mmol/min, what is the concentration of glu\cose in the medium after 10 minutes?
A. 0.05 M
B. 0.09 M
C. 0.11 M
D. 0.13 M
Question 13
A cell has a diameter of 10 μm and a volume of 1000 μm³. If the cell is spherical, what is its surface area?
A. 100 μm²
B. 200 μm²
C. 300 μm²
D. 400 μm²
Question 14
In a population of 1000 individuals, 20% are homozygous dominant, 40% are heterozygous, and 40% are homozygous recessive. What is the probability that two individuals chosen at random will have offspring with the dominant trait?
A. 0.36
B. 0.48
C. 0.64
D. 0.72
Question 15
A cell is placed in a medium with a pH of 7.5. If the cell has a buffering capacity of 0.1 M, what is the concentration of hydrogen ions in the medium?
A. 1.0 \times 10^{-6}
B. 1.0 \times 10^{-7.5}
C. 1.0 \times 10^{-8}
D. 1.0 \times 10^{-9}

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