POST UTME OAU 2024 Biology | Objective

Are you preparing for POST UTME OAU 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.

Practice these randomly selected questions to test your readiness.

Question 1
In the context of respiration, what is the primary function of the mitochondria?
Correct A. To synthesize ATP from glu\cose
B. To break down glu\cose into pyruvate
C. To produce NADH and FADH2 from glycolysis
D. To convert pyruvate into acetyl-CoA

Correct Answer: A

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Question 2
A diagram of a typical terrestrial e\cosystem is shown below. Which of the following organisms would be most likely to be a primary consumer?
Correct A. Herbivore B
B. Carnivore C
C. Decomposer D
D. Primary Producer A

Correct Answer: A

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Question 3
A diagram of the human eye is shown below. Which of the following is the primary function of the lens?
Correct A. To focus light on the retina
B. To produce tears for lubrication
C. To regulate the amount of light entering the eye
D. To detect color

Correct Answer: A

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Question 4
A diagram of a typical aquatic e\cosystem is shown below. Which of the following organisms would be most likely to be a decomposer?
A. Phytoplankton A
B. Zooplankton B
Correct C. Bacterium C
D. Detritivore D

Correct Answer: C

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Question 5
A diagram of the human brain is shown below. Which of the following is the primary function of the cerebellum?
A. To control voluntary movements
B. To regulate body temperature
Correct C. To maintain posture and balance
D. To process sensory information

Correct Answer: C

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Question 6
In a population of 1000 individuals, 20% are heterozygous for a particular gene, while 80% are homozygous recessive. If the population is randomly mated, what is the expected frequency of the heterozygous genotype in the offspring?
Correct A. 0.25
B. 0.30
C. 0.35
D. 0.40

Correct Answer: A

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Question 7
A researcher is studying the effect of pH on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different pH levels and plots the data on a graph. Which of the following types of graphs would best represent the data?
A. A scatter plot
Correct B. A line graph
C. A bar chart
D. A histogram

Correct Answer: B

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Question 8
A patient is diagnosed with a genetic disorder that is caused by a mutation in a specific gene. The patient's family history reveals that the disorder is inherited in an autosomal dominant pattern. Which of the following statements is true about the inheri\tance of this disorder?
A. The disorder will only be expressed in individuals who inherit two copies of the mutated gene.
Correct B. The disorder will be expressed in individuals who inherit one copy of the mutated gene.
C. The disorder will not be expressed in individuals who inherit one copy of the mutated gene.
D. The disorder will only be expressed in individuals who inherit no copies of the mutated gene.

Correct Answer: B

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Question 9
A researcher is studying the effect of temperature on the rate of a chemical reaction. The researcher measures the rate of the reaction at different temperatures and plots the data on a graph. Which of the following types of graphs would best represent the data?
A. A scatter plot
Correct B. A line graph
C. A bar chart
D. A histogram

Correct Answer: B

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Question 10
A patient is diagnosed with a genetic disorder that is caused by a mutation in a specific gene. The patient's family history reveals that the disorder is inherited in an autosomal recessive pattern. Which of the following statements is true about the inheri\tance of this disorder?
A. The disorder will only be expressed in individuals who inherit two copies of the mutated gene.
B. The disorder will be expressed in individuals who inherit one copy of the mutated gene.
Correct C. The disorder will not be expressed in individuals who inherit one copy of the mutated gene.
D. The disorder will only be expressed in individuals who inherit no copies of the mutated gene.

Correct Answer: C

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Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, calculate the number of individuals that are homozygous recessive.
A. 100
Correct B. 200
C. 300
D. 400

Correct Answer: B

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Question 12
A 2-year-old child is brought to the hospital with symptoms of malabsorption. The child's stool is pale and bulky. Which of the following enzymes is most likely deficient?
Correct A. Lactase
B. Sucrase
C. Maltase
D. Amylase

Correct Answer: A

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Question 13
A 30-year-old woman presents with a 2-year history of amenorrhea. Her physical examination reveals a normal secondary sexual characteristic development, but her pelvic examination shows a small uterus. What is the most likely diagnosis?
A. Kallmann syndrome
B. Sheehan syndrome
C. Turner syndrome
Correct D. Roki\tansky-Kuster-Hauser syndrome

Correct Answer: D

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Question 14
A 40-year-old man presents with a 5-year history of hypertension. His physical examination reveals a blood pressure of 180/100 mmHg. What is the most likely cause of his hypertension?
Correct A. Renal artery stenosis
B. Coarctation of the aorta
C. Pheochromocytoma
D. Primary aldosteronism

Correct Answer: A

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Question 15
A 25-year-old woman presents with a 2-year history of infertility. Her physical examination reveals a normal secondary sexual characteristic development, but her pelvic examination shows a normal-sized uterus. What is the most likely diagnosis?
Correct A. Polycystic ovary syndrome
B. Endometriosis
C. Tubal ligation
D. Premature ovarian failure

Correct Answer: A

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Question 16
The nervous system's coordination of muscle contractions and relaxations is primarily regulated by the
A. Sympathetic nervous system
Correct B. Parasympathetic nervous system
C. Motor neurons
D. Muscle spindles

Correct Answer: B

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Question 17
The process of natural selection acts on
Correct A. Genetic variation
B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: A

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Question 18
The Hardy-Weinberg principle assumes that populations are
Correct A. Randomly mating
B. Genetically homogeneous
C. Subject to mutation
D. Experiencing gene flow

Correct Answer: A

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Question 19
The xylem transports
Correct A. Water and minerals
B. Sugars and amino acids
C. Oxygen and carbon dioxide
D. Hormones and waste products

Correct Answer: A

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Question 20
The process of meiosis results in
Correct A. Four haploid cells
B. Two diploid cells
C. One diploid cell
D. No change in ploidy

Correct Answer: A

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Question 21
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'?
A. 0.36
Correct B. 0.64
C. 0.72
D. 0.84

Correct Answer: B

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Question 22
A 2.5-liter sample of a gas at 27°C and 1 atm is compressed to 0.5 liters at 127°C. What is the final pressure of the gas?
A. 3.5 atm
B. 4.2 atm
Correct C. 5.1 atm
D. 6.5 atm

Correct Answer: C

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Question 23
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'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 24
A 10-gram sample of a subs\tance is dissolved in 50 grams of water. What is the concentration of the solution in g/100g?
A. 0.16 g/100g
Correct B. 0.20 g/100g
C. 0.24 g/100g
D. 0.28 g/100g

Correct Answer: B

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Question 25
A population of bacteria grows according to the equation N(t) = 2000e^(0.2t), where N(t) is the population at time t. If the population at time t = 0 is 2000, what is the population at time t = 5?
A. 2000
B. 4000
Correct C. 6000
D. 8000

Correct Answer: C

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