POST UTME RSU 2023 Biology | Objective

Are you preparing for POST UTME RSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic, 15% are resis\tant, and the remaining 5% are in a latent state. If 200 bacteria are exposed to the antibiotic, what is the expected number of bacteria that will be killed?
Correct A. 150
B. 200
C. 250
D. 300

Correct Answer: A

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Question 2
A 2.5-liter flask contains 1.5 liters of oxygen gas at 25°C and 1 atm. If 0.5 liters of oxygen gas is removed, what is the new partial pressure of oxygen in the flask?
A. 0.5 atm
Correct B. 0.75 atm
C. 1 atm
D. 1.25 atm

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 4
A 50-gram sample of a subs\tance is dissolved in 100 milliliters of water. If the solution has a pH of 4.5, what is the concentration of hydrogen ions in the solution?
Correct A. 10^-4 M
B. 10^-5 M
C. 10^-6 M
D. 10^-7 M

Correct Answer: A

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Question 5
A diagram of a simple circuit is shown below. If the battery has a voltage of 9 volts and the resistor has a resis\tance of 2 ohms, what is the current in the circuit?
A. 3 A
B. 4 A
C. 5 A
Correct D. 6 A

Correct Answer: D

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Question 6
In the context of evolutionary theory, what is the primary mechanism by which genetic drift acts on a population?
A. Natural selection
Correct B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: B

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Question 7
A patient is diagnosed with a bacterial infection. The bacteria are gram-positive and have a characteristic 'chain of beads' appearance under the microscope. Which of the following is the most likely cause of this infection?
A. Staphylococcus aureus
Correct B. Streptococcus pneumoniae
C. Escherichia coli
D. Klebsiella pneumoniae

Correct Answer: B

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Question 8
A researcher is studying the effects of climate change on a particular species of plant. The plant has a unique adaptation that allows it to survive in high temperatures. What is the primary mechanism by which this adaptation works?
A. Cryopreservation
B. Hormesis
Correct C. Heat shock proteins
D. Antioxidant enzymes

Correct Answer: C

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Question 9
A patient is experiencing symptoms of a neuro\logical disorder. The patient's brain scan shows a characteristic 'ring of fire' appearance. What is the most likely diagnosis?
Correct A. Multiple sclerosis
B. Amyotrophic lateral sclerosis
C. Parkinson's disease
D. Huntington's disease

Correct Answer: A

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Question 10
A researcher is studying the effects of a new medication on a particular disease. The medication has a unique mechanism of action that involves the inhibition of a specific enzyme. What is the primary mechanism by which this enzyme is inhibited?
A. Competitive inhibition
Correct B. Non-competitive inhibition
C. Uncompetitive inhibition
D. Allosteric inhibition

Correct Answer: B

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Question 11
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood pressure
C. Stimulation of the immune system
Correct D. Response to stress and anxiety

Correct Answer: D

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Question 12
A researcher is studying the effects of light intensity on plant growth. Which of the following types of eco\logical communities would be most relevant to this study?
A. Desert e\cosystem
Correct B. Tropical rainforest
C. Grassland
D. Alpine meadow

Correct Answer: B

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Question 13
A patient is experiencing symptoms of hypothyroidism. Which of the following transport systems is most likely to be affected?
A. Xylem
B. Phloem
Correct C. Blood
D. Lymphatic system

Correct Answer: C

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Question 14
A bio\logist is studying the structure of a plant cell. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Endoplasmic reticulum
D. Lysosome

Correct Answer: B

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Question 15
A researcher is studying the effects of pollution on a freshwater e\cosystem. Which of the following types of eco\logical cycles would be most relevant to this study?
A. Water cycle
B. Carbon cycle
Correct C. Nitrogen cycle
D. Phosphorus cycle

Correct Answer: C

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Question 16
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 17
A plant cell has a vacuole that contains 0.5 M sucrose solution. If the cell membrane is selectively permeable and has a permeability coefficient of 2.5 x 10^-6 cm/s for sucrose, what is the rate of sucrose efflux from the vacuole?
A. 1.25 x 10^-5 cm^3/s
Correct B. 2.5 x 10^-5 cm^3/s
C. 5.0 x 10^-5 cm^3/s
D. 7.5 x 10^-5 cm^3/s

Correct Answer: B

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Question 18
A 2.5 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. If the amount of carbon dioxide produced is 1.8 g and the amount of water produced is 0.5 g, what is the empirical formula of the compound?
Correct A. C2H4
B. C3H6
C. C4H8
D. C5H10

Correct Answer: A

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Question 19
A 10 mL sample of a 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the pH of the solution at the equivalence point is 8.5, what is the value of Ka for the acid?
A. 1.0 x 10^-5
Correct B. 1.0 x 10^-6
C. 1.0 x 10^-7
D. 1.0 x 10^-8

Correct Answer: B

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Question 20
A 5.0 g sample of a mixture of NaCl and KCl is analyzed by flame photometry. If the amount of sodium detected is 2.5 g and the amount of potassium detected is 1.0 g, what is the percentage composition of the mixture?
Correct A. NaCl: 60%, KCl: 40%
B. NaCl: 40%, KCl: 60%
C. NaCl: 50%, KCl: 50%
D. NaCl: 30%, KCl: 70%

Correct Answer: A

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Question 21
In a desert e\cosystem, the primary producers are cacti and succulents. What is the role of these plants in the desert e\cosystem?
A. They are the primary consumers.
B. They are the decomposers.
Correct C. They are the primary producers.
D. They are the secondary consumers.

Correct Answer: C

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Question 22
A 2.5-liter solution of 0.5 M NaCl is prepared. What is the number of moles of NaCl in the solution?
Correct A. 1.25 mol
B. 2.5 mol
C. 0.5 mol
D. 1.25 g

Correct Answer: A

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Question 23
In a population of 1000 rabbits, 200 are born, 50 die, and 150 are eaten by predators. What is the net change in population?
Correct A. 150
B. 200
C. 50
D. 1000

Correct Answer: A

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Question 24
A 10-kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum kinetic energy of the block?
A. 2 J
Correct B. 5 J
C. 10 J
D. 20 J

Correct Answer: B

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Question 25
A 0.5 M solution of HCl is prepared by dissolving 25 g of HCl in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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