POST UTME UNIPORT 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the Δπηυσες (Δπηυσες) complex. What is the primary function of the Δπηυσες complex in this process?
A. To condense the chromosomes
B. To break down the nuclear envelope
C. To separate the sister chromatids
D. To initiate DNA replication
Question 2
A geneticist is studying the inheri\tance of a trait in a family. Which of the following genetic patterns is consistent with an autosomal dominant inheri\tance pattern?
A. A dominant allele (A) will always be expressed over a recessive allele (a)
B. A dominant allele (A) will always be expressed over a dominant allele (A)
C. A recessive allele (a) will always be expressed over a dominant allele (A)
D. A dominant allele (A) will always be expressed over a dominant allele (A)
Question 3
A population of a species is said to be in a state of eco\logical balance when the number of individuals remains relatively cons\tant over time. Which of the following factors can contribute to this balance?
A. Predation
B. Competition
C. Mutualism
D. All of the above
Question 4
A patient with a rare genetic disorder has a mutation in the HFE gene, leading to an accumulation of iron in the body. Which of the following organs is most likely to be affected by this condition?
A. Liver
B. Kidneys
C. Pancreas
D. Heart
Question 5
In a typical xylem vessel, what is the primary function of the lignin component in the cell wall?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To store starch and other nutrients
Question 6
The growth of a plant is influenced by
A. Only the availability of water
B. Only the availability of light
C. Both the availability of water and light
D. Neither the availability of water nor light
Question 7
In a photosynthetic pathway, which enzyme catalyzes the conversion of CO2 to a 3-carbon molecule?
A. RuBisCO
B. PEPC
C. Phosphoglycerate kinase
D. Fructose-1,6-bisphosphatase
Question 8
In a population of 1000 individuals, 50% have the genotype BB, 30% have the genotype Bb, and 20% have the genotype bb. What is the frequency of the B allele?
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 9
In a typical e\cosystem, the following organisms are found in a terrestrial e\cosystem:
A. Trees, Grasses, Fungi
B. Grasses, Trees, Fungi
C. Fungi, Trees, Grasses
D. Trees, Fungi, Grasses
Question 10
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating water balance in the body?
A. To produce antidiuretic hormone (ADH)
B. To regulate thirst
C. To control blood pressure
D. To manage electrolyte balance
Question 11
In a typical e\cosystem, the following organisms are found in a freshwater lake:
A. Algae, Zooplankton, Bacteria
B. Phytoplankton, Zooplankton, Bacteria
C. Phytoplankton, Zooplankton, Algae
D. Bacteria, Algae, Zooplankton
Question 12
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following statements is true regarding the optimal temperature range for microbial growth?
A. Temperature 20-30°C
B. Temperature 30-40°C
C. Temperature 40-50°C
D. Temperature 50-60°C
Question 13
A species is said to be extinct when its last individual dies. Which of the following statements is TRUE?
A. A species is said to be extinct when its population size decreases.
B. A species is said to be extinct when its population size increases.
C. A species is said to be extinct when its last individual dies.
D. A species is said to be extinct when its population size remains cons\tant.
Question 14
A researcher is studying the effect of pH on the growth of E. coli bacteria. Which of the following statements is true regarding the optimal pH range for E. coli growth?
A. pH 6.0-7.0
B. pH 7.0-8.0
C. pH 8.0-9.0
D. pH 9.0-10.0
Question 15
A 2.5-g sample of a compound containing only carbon and hydrogen is burned in a combustion chamber. The volume of carbon dioxide produced is 2.1 liters at 25°C and 1 atm. What is the empirical formula of the compound?
A. CH
B. C2H4
C. C3H6
D. C4H8

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