POST UTME ACHIEVERS UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME ACHIEVERS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a eukaryotic cell, what is the primary function of the Golgi apparatus?
A. Protein synthesis
B. Cell signaling
Correct C. Protein modification and transport
D. Cell division

Correct Answer: C

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Question 2
A researcher is studying the effect of a new antibiotic on a bacterial culture. Which of the following is a likely outcome of the antibiotic treatment?
A. Increased bacterial growth
Correct B. Decreased bacterial growth
C. No effect on bacterial growth
D. Increased bacterial mutation

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. What is the function of the cell wall?
Correct A. Supports the cell
B. Regulates cell growth
C. Provides protection from pathogens
D. Involved in cell signaling

Correct Answer: A

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Question 4
A geneticist is studying the inheri\tance of a particular trait in a population. Which of the following is a type of genetic variation?
Correct A. Mutation
B. Gene duplication
C. Gene deletion
D. Gene expression

Correct Answer: A

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Question 5
A diagram of a human eye is shown below. What is the function of the retina?
A. Detects light
B. Regulates pupil size
C. Focuses light
Correct D. Transmits visual signals to the brain

Correct Answer: D

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Question 6
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. If two individuals are chosen at random from this population, what is the probability that they are both homozygous recessive?
Correct A. 0.025
B. 0.05
C. 0.1
D. 0.2

Correct Answer: A

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Question 7
A diagram of a plant cell is shown below. Identify the part labeled 'X'.
A. A
B. B
C. C
D. D

Correct Answer: E

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Question 8
A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angular velocity of the bird's wings?
A. 10 rad/s
Correct B. 20 rad/s
C. 30 rad/s
D. 40 rad/s

Correct Answer: B

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Question 9
A diagram of a chemical reaction is shown below. Identify the type of reaction.
Correct A. Synthesis reaction
B. Decomposition reaction
C. Combination reaction
D. Replacement reaction

Correct Answer: A

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Question 10
A population of bacteria is growing exponentially. If the initial population is 1000 and the growth rate is 20% per hour, what is the population after 3 hours?
A. 1600
B. 2000
Correct C. 2400
D. 3000

Correct Answer: C

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Question 11
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 12
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To transport water and minerals
Correct B. To store starch and other nutrients
C. To produce \tannins and other defense compounds
D. To regulate water potential

Correct Answer: B

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Question 13
What is the primary mechanism by which microorganisms cause disease in humans?
A. Invasion of host cells
Correct B. Toxin production
C. Immune system suppression
D. Antibiotic resis\tance

Correct Answer: B

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Question 14
In the nervous system, what is the primary function of the axon hillock?
Correct A. To generate action potentials
B. To transmit signals to other neurons
C. To synthesize neurotransmitters
D. To regulate ion channels

Correct Answer: A

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Question 15
In the e\cosystem, what is the primary function of the decomposers?
A. To produce organic compounds
Correct B. To break down dead organisms
C. To synthesize nutrients
D. To regulate population growth

Correct Answer: B

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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 cell division, what is the primary function of the centrioles?
Correct A. To form the spindle fibers
B. To separate the chromosomes
C. To form the nuclear envelope
D. To synthesize DNA

Correct Answer: A

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Question 18
The classification of living organisms is based on the following characteristics. Which of the following is NOT a characteristic used in the classification of living organisms?
A. Cell structure
B. Morpho\logy
C. Behavior
Correct D. Geographic distribution

Correct Answer: D

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Question 19
The process of digestion in the human body involves the breakdown of food into smaller molecules. Which of the following enzymes is responsible for the breakdown of proteins?
A. Amylase
B. Lipase
C. Pep\sin
Correct D. Tryp\sin

Correct Answer: D

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Question 20
The human immune system is composed of various cells and organs that work together to protect the body against pathogens. Which of the following cells is responsible for the production of antibodies?
Correct A. B cells
B. T cells
C. Macrophages
D. Neutrophils

Correct Answer: A

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Question 21
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 protein kinase Cdc28. What is the primary function of the Cdc28 protein?
Correct A. To phosphorylate and activate the cyclin-dep\endent kinase
B. To bind to and inhibit the anaphase-promoting complex
C. To regulate the expression of the histone genes
D. To control the assembly of the mitotic spindle

Correct Answer: A

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Question 22
A population of Drosophila melanogaster is being studied for its genetic variation. The population has a mean wing length of 5.2 mm and a s\tandard deviation of 0.8 mm. If a sample of 16 flies is taken from the population, what is the probability that the sample mean wing length will be greater than 5.5 mm?
Correct A. 0.05
B. 0.01
C. 0.005
D. 0.0005

Correct Answer: A

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Question 23
A microorganism is isolated from a patient's blood culture and identified as Staphylococcus aureus. The organism is resis\tant to methicillin and has a minimum inhibitory concentration (MIC) of 16 μg/mL for vancomycin. What is the most likely mechanism of resis\tance?
A. Efflux pump-mediated resis\tance
B. Enzymatic inactivation of vancomycin
Correct C. Target modification of the vancomycin binding site
D. Increased expression of the vancomycin target gene

Correct Answer: C

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Question 24
A diagram of a simple e\cosystem is shown below. What is the primary role of the decomposers in this e\cosystem?
A. To produce organic compounds from inorganic subs\tances
Correct B. To break down dead organisms and recycle nutrients
C. To synthesize complex molecules from simple subs\tances
D. To regulate the population size of the animal

Correct Answer: B

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Question 25
A diagram of a simple circuit is shown below. What is the primary function of the resistor in this circuit?
Correct A. To reduce the voltage across the light bulb
B. To increase the current flowing through the light bulb
C. To regulate the temperature of the light bulb
D. To control the brightness of the light bulb

Correct Answer: A

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