POST UTME UNIOSUN 2024 Biology | Objective

Are you preparing for POST UTME UNIOSUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, resulting in the release of the chromosomes into the cytoplasm. Which stage of mitosis is characterized by the condensation of chromosomes and the formation of the spindle apparatus?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 2
The diagram below represents a cross-section of a plant root.
A. The xylem is responsible for transporting water and minerals from the roots to the leaves.
B. The phloem is responsible for transporting sugars and other organic compounds from the leaves to the roots.
Correct C. The root hair cells are responsible for absorbing water and minerals from the soil.
D. The root cap protects the root from damage as it grows through the soil.

Correct Answer: C

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Question 3
In a population of rabbits, the average lifespan is 5 years. If the population is growing at a rate of 20% per year, what is the expected number of rabbits in the population after 3 years?
A. 120
B. 150
Correct C. 180
D. 200

Correct Answer: C

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Question 4
The diagram below represents a simple circuit.
Correct A. The circuit is closed when the switch is in the 'on' position.
B. The circuit is open when the switch is in the 'off' position.
C. The circuit is closed when the switch is in the 'off' position.
D. The circuit is open when the switch is in the 'on' position.

Correct Answer: A

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Question 5
In a sample of 100 bacteria, 20 are resis\tant to a certain antibiotic. If a random sample of 10 bacteria is taken from the population, what is the probability that the sample will contain at least 2 bacteria that are resis\tant to the antibiotic?
A. 0.2
B. 0.3
Correct C. 0.4
D. 0.5

Correct Answer: C

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Question 6
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 7
A researcher is studying the effect of pH on the growth of Escherichia coli. The graph below shows the growth rate of the bacteria at different pH levels. What is the pH level at which the growth rate is maximum?
A. 6.5
Correct B. 7.0
C. 7.5
D. 8.0

Correct Answer: B

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Question 8
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. The antibiotic of choice for this infection is
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
Correct D. Vancomycin

Correct Answer: D

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Question 9
A researcher is studying the effect of temperature on the growth of Saccharomyces cerevisiae. The graph below shows the growth rate of the yeast at different temperatures. What is the temperature at which the growth rate is maximum?
A. 25°C
Correct B. 30°C
C. 35°C
D. 40°C

Correct Answer: B

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Question 10
A patient is diagnosed with a viral infection caused by Influenza virus. The treatment of choice for this infection is
Correct A. Oseltamivir
B. Ribavirin
C. Zanamivir
D. Amantadine

Correct Answer: A

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Question 11
In the context of evolutionary theory, what is the primary mechanism by which genetic drift can lead to the fixation of a deleterious allele?
A. Genetic hitchhiking
B. Bottleneck effect
C. Founder effect
Correct D. Genetic drift

Correct Answer: D

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Question 12
A researcher is studying the effect of light intensity on the growth of radish plants. The data collected is as follows: Light Intensity \( μmol/m²/s \) Growth Rate \( cm/day \) 100 2.5 200 3.2 300 4.1 400 5.0 500 6.0 What is the best-fit linear equation for this data?
Correct A. y = 0.01x + 1.5
B. y = 0.02x + 1.0
C. y = 0.03x - 0.5
D. y = 0.04x - 1.0

Correct Answer: A

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Question 13
A cell is placed in a solution containing 0.1 M glu\cose and 0.2 M fructose. The cell membrane is permeable to both glu\cose and fructose. What is the concentration of glu\cose in the cell after 10 minutes?
A. 0.05 M
Correct B. 0.075 M
C. 0.1 M
D. 0.125 M

Correct Answer: B

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Question 14
A population of rabbits is growing \logistically according to the equation dP/dt = rP\( 1 - P/K \), where P is the population size, r is the intrinsic growth rate, and K is the carrying capacity. If the initial population size is 100, the intrinsic growth rate is 0.5, and the carrying capacity is 1000, what is the population size after 10 years?
A. 500
B. 750
Correct C. 1000
D. 1250

Correct Answer: C

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Question 15
A DNA molecule consists of two complementary strands of nucleotides. If the sequence of one strand is 5'-ATCG-3', what is the sequence of the complementary strand?
Correct A. 5'-TAGC-3'
B. 5'-TCGA-3'
C. 5'-GATC-3'
D. 5'-CGTA-3'

Correct Answer: A

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Question 16
In a population of 1000 individuals, 200 are heterozygous for a particular gene, 300 are homozygous dominant, and 500 are homozygous recessive. What is the frequency of the recessive allele?
A. 0.2
B. 0.3
Correct C. 0.5
D. 0.7

Correct Answer: C

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Question 17
A 2-year-old child is diagnosed with a rare genetic disorder characterized by the inability to break down certain amino acids. Which of the following is a likely consequence of this disorder?
Correct A. Elevated levels of ammonia in the blood
B. Increased risk of kidney stones
C. Impaired cognitive function
D. Delayed growth and development

Correct Answer: A

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Question 18
A patient is diagnosed with a bacterial infection that is resis\tant to multiple antibiotics. Which of the following is a likely mechanism of resis\tance?
A. Efflux pumps
Correct B. Enzymatic modification of the antibiotic
C. Target modification
D. Biofilm formation

Correct Answer: B

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Question 19
A 30-year-old woman is diagnosed with a rare genetic disorder characterized by the inability to produce melanin. Which of the following is a likely consequence of this disorder?
A. Increased risk of skin cancer
B. Impaired cognitive function
C. Delayed growth and development
Correct D. Albinism

Correct Answer: D

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Question 20
A patient is diagnosed with a viral infection that is characterized by the production of a specific type of antibody. Which of the following is a likely type of antibody produced in response to this infection?
A. IgA
B. IgG
Correct C. IgM
D. IgE

Correct Answer: C

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Question 21
In the context of hormonal coordination, which of the following is a characteristic of a negative feedback mechanism?
A. Increased hormone production
Correct B. Decreased hormone production
C. No change in hormone production
D. Increased hormone secretion

Correct Answer: B

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Question 22
A diagram of the xylem tissue is shown below. What is the primary function of the tracheids in this tissue?
Correct A. Transport of water and minerals
B. Support and structure
C. Storage of nutrients
D. Protection from pathogens

Correct Answer: A

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Question 23
In the process of cellular respiration, which of the following is a byproduct of the citric acid cycle?
A. ATP
B. NADH
Correct C. FADH2
D. Pyruvate

Correct Answer: C

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Question 24
A diagram of the human nervous system is shown below. What is the primary function of the cerebellum?
Correct A. Control of voluntary movements
B. Regulation of body temperature
C. Proces\sing of sensory information
D. Production of hormones

Correct Answer: A

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Question 25
In the context of growth and development, which of the following is a characteristic of a hormone that promotes cell growth?
Correct A. Increased cell division
B. Decreased cell growth
C. No change in cell growth
D. Increased cell death

Correct Answer: A

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