POST UTME UNIOSUN 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a simple e\cosystem is shown below. What is the role of the structure labeled B?
A. to produce energy for the e\cosystem
B. to synthesize nutrients
C. to regulate water flow
D. to maintain soil quality
Question 2
The process of digestion \begins in the mouth, where food is chewed and mixed with saliva. Which of the following enzymes is responsible for breaking down proteins in the stomach?
A. Pep\sin
B. Lactase
C. Amylase
D. Tryp\sin
Question 3
A patient is diagnosed with a rare genetic disorder that affects the production of the enzyme phenylalanine hydroxylase. Which of the following symptoms is most likely to be associated with this disorder?
A. Mental retardation
B. Seizures
C. Skin discoloration
D. Growth retardation
Question 4
A cell in interphase has a DNA content of 6.0 pg. If the cell is in the G2 phase of the cell cycle, what is the DNA content of the cell?
A. 3.0 pg
B. 6.0 pg
C. 9.0 pg
D. 12.0 pg
Question 5
A microorganism is isolated from a patient's blood sample and identified as Staphylococcus aureus. Which of the following characteristics is a common feature of this microorganism?
A. Gram-positive
B. Gram-negative
C. Spore-forming
D. Motile
Question 6
A study on the genetic variation of a population found that the frequency of the recessive allele is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 7
In the context of organ systems, what is the primary function of the integumentary system?
A. To regulate body temperature
B. To protect the body from external damage
C. To facilitate the exchange of nutrients and waste products
D. To regulate the immune response
Question 8
The process by which plants release water vapor into the air through their leaves is called _______________.
A. transpiration
B. respiration
C. photosynthesis
D. evaporation
Question 9
A researcher is studying the effects of a new pesticide on a plant culture. The pesticide is found to inhibit the synthesis of the plant hormone auxin. What is the primary effect of the pesticide on the plant?
A. Inhibition of root growth
B. Inhibition of leaf growth
C. Inhibition of stem growth
D. Inhibition of flower formation
Question 10
What is the primary mechanism by which the circulatory system regulates blood pressure?
A. Through the regulation of heart rate
B. Through the control of breathing rate
C. Through the exchange of CO2 and O2 in the lungs
D. Through the regulation of blood vessel diameter
Question 11
A person has a blood type of AB. If the person's genotype is AB, what is the probability that their offspring will have blood type O?
A. 0
B. 0.25
C. 0.5
D. 1
Question 12
What is the primary mechanism by which the nervous system regulates the timing of sleep-wake cycles?
A. Through the regulation of hormone levels
B. Through the control of breathing rate
C. Through the exchange of CO2 and O2 in the lungs
D. Through the regulation of body temperature
Question 13
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.36
B. 0.64
C. 0.16
D. 0.48
Question 14
What is the primary mechanism by which the nervous system regulates muscle contraction?
A. Through the release of neurotransmitters
B. Through the regulation of hormone levels
C. Through the exchange of CO2 and O2 in the lungs
D. Through the regulation of body temperature
Question 15
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of the enzyme glu\cose-6-phosphatase. Which of the following symptoms is most likely to be associated with this disorder?
A. Hypoglycemia
B. Hyperglycemia
C. Growth retardation
D. Developmental delay

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