POST UTME SKYLINE UNIVERSITY 2022 Biology | Objective

Are you preparing for POST UTME SKYLINE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'RR'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 3
The graph below shows the growth of a population of E. coli over time. What is the rate of growth of the population?
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 4
A diagram of the human circulatory system is shown below. Which part of the system is responsible for transporting oxygenated blood to the body?
Correct A. Arteries
B. Veins
C. Capillaries
D. Lungs

Correct Answer: A

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Question 5
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if the population is large, randomly mating, and subject to no mutation or gene flow. Which of the following is a consequence of the Hardy-Weinberg principle?
A. The frequency of alleles will increase over time.
Correct B. The frequency of alleles will remain cons\tant over time.
C. The frequency of alleles will decrease over time.
D. The frequency of alleles will increase in one generation and decrease in the next.

Correct Answer: B

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Question 6
A study on the evolution of antibiotic resis\tance in bacteria revealed that the rate of resis\tance development is influenced by the presence of certain genes. Which of the following best describes the relationship between gene expression and antibiotic resis\tance?
A. Gene expression is directly proportional to antibiotic resis\tance.
B. Gene expression is inversely proportional to antibiotic resis\tance.
C. Gene expression has no effect on antibiotic resis\tance.
Correct D. Gene expression is a necessary but not sufficient condition for antibiotic resis\tance.

Correct Answer: D

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Question 7
A patient is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid phenylalanine. Which of the following enzymes is most likely deficient in this patient?
Correct A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase

Correct Answer: A

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Question 8
A diagram of the human circulatory system is shown below. Which of the following vessels is responsible for returning deoxygenated blood from the body to the heart?
Correct A. Vena cava
B. Pulmonary artery
C. Aorta
D. Coronary artery

Correct Answer: A

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Question 9
A patient is diagnosed with a rare disorder characterized by an inability to synthesize the amino acid tyro\sine. Which of the following enzymes is most likely deficient in this patient?
A. Phenylalanine hydroxylase
Correct B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase

Correct Answer: B

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Question 10
A diagram of the human nervous system is shown below. Which of the following nerves is responsible for transmitting sensory information from the skin to the brain?
Correct A. Trigeminal nerve
B. Vagus nerve
C. Sciatic nerve
D. Optic nerve

Correct Answer: A

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Question 11
In the context of respiratory physio\logy, what is the primary function of the parasympathetic nervous system in regulating breathing rate?
A. Increa\sing respiratory rate
Correct B. Decrea\sing respiratory rate
C. Regulating depth of breathing
D. Controlling rate of gas exchange

Correct Answer: B

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Question 12
A patient with a history of recurrent respiratory infections is diagnosed with a condition characterized by an abnormality in the structure of the cilia lining the respiratory tract. Which of the following conditions is most likely responsible for this patient's symptoms?
A. Cystic fibrosis
Correct B. Primary ciliary dyskinesia
C. Bronchiectasis
D. Chronic obstructive pulmonary disease (COPD)

Correct Answer: B

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Question 13
A researcher is studying the effects of antibiotics on the growth of a specific type of bacteria. The researcher notices that the bacteria are becoming increa\singly resis\tant to the antibiotic over time. What is the most likely explanation for this observation?
Correct A. The bacteria are undergoing a process of natural selection
B. The antibiotic is being used at a suboptimal concentration
C. The bacteria are experiencing a mutation in their DNA
D. The bacteria are being exposed to a different type of antibiotic

Correct Answer: A

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Question 14
A patient presents with symptoms of malabsorption, including diarrhea and weight loss. Laboratory tests reveal a deficiency in the enzyme lactase. What is the most likely cause of this patient's symptoms?
A. Celiac disease
B. Crohn's disease
Correct C. Lactose intolerance
D. Pancreatic insufficiency

Correct Answer: C

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Question 15
A researcher is studying the genetic basis of a specific disease. The researcher discovers that the disease is caused by a mutation in a gene that codes for a protein involved in the regulation of cell growth. What is the most likely type of mutation responsible for this disease?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion mutation
D. Insertion mutation

Correct Answer: A

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Question 16
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 17
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Regulation of hunger and thirst
C. Regulation of blood pressure
Correct D. Regulation of hormone secretion

Correct Answer: D

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Question 18
The cell cycle consists of four main stages: interphase, prophase, metaphase, and telophase. Which of the following is a characteristic of the prophase stage?
Correct A. Condensation of chromosomes
B. Separation of chromosomes
C. Formation of the spindle fibers
D. Division of the cytoplasm

Correct Answer: A

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Question 19
The process of digestion in the human body involves the breakdown of complex molecules into simpler ones. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
Correct C. Tryp\sin
D. Lactase

Correct Answer: C

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Question 20
The theory of evolution by natural selection proposes that species adapt to their environments through the process of mutation and genetic drift. Which of the following is an example of genetic drift?
A. Mutation
B. Genetic recombination
C. Gene flow
Correct D. Genetic drift

Correct Answer: D

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Question 21
The human body is composed of various systems, including the nervous, circulatory, and digestive systems. Which of the following is a function of the nervous system?
A. Regulation of body temperature
B. Regulation of hunger and thirst
C. Regulation of blood pressure
Correct D. Transmission of nerve impulses

Correct Answer: D

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Question 22
The process of mitosis involves the division of a cell into two daughter cells. Which of the following is a characteristic of the metaphase stage?
A. Condensation of chromosomes
B. Separation of chromosomes
C. Formation of the spindle fibers
Correct D. Alignment of chromosomes at the metaphase plate

Correct Answer: D

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Question 23
The human body is composed of various tissues, including epithelial, connective, and muscle tissues. Which of the following is a characteristic of epithelial tissue?
A. Presence of blood vessels
B. Presence of nerve cells
C. Presence of muscle fibers
Correct D. Presence of a basement membrane

Correct Answer: D

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Question 24
The process of photosynthesis involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 25
The theory of evolution by natural selection proposes that species adapt to their environments through the process of mutation and genetic drift. Which of the following is an example of mutation?
A. Gene flow
B. Genetic recombination
Correct C. Mutation
D. Genetic drift

Correct Answer: C

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