POST UTME ABU 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1M solution of NaOH is mixed with a 0.1M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 2
The reaction 2A + B → 2C is catalyzed by the enzyme A. The enzyme has a Km of 0.5 M and a Vmax of 100 units. If the substrate concentration is 1 M, what is the rate of the reaction?
A. 50 units
B. 66.67 units
C. 75 units
D. 100 units
Question 3
A diagram shows a neuron with a long axon. What is the function of the axon?
A. To transmit signals to other neurons.
B. To synthesize neurotransmitters.
C. To store genetic information.
D. To regulate cell growth.
Question 4
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 fluid balance
C. Response to stress and anxiety
D. Regulation of appetite and satiety
Question 5
In a diploid cell, what is the total number of chromosomes if the cell has 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes?
A. 44
B. 46
C. 48
D. 50
Question 6
In the context of growth and regulation, what is the primary mechanism by which cells grow and divide?
A. Mitosis
B. Meiosis
C. Apoptosis
D. Differentiation
Question 7
A diagram of a neuron is shown below. What is the function of the part labeled 'D'?
A. To transmit signals to other neurons
B. To receive signals from other neurons
C. To produce neurotransmitters
D. To synthesize proteins
Question 8
The reaction 2A + B → 2C is catalyzed by the enzyme A. The enzyme has a Km of 0.5 M and a Vmax of 100 units. If the substrate concentration is 1 M, what is the rate of the reaction?
A. 50 units
B. 66.67 units
C. 75 units
D. 100 units
Question 9
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Site of protein synthesis
B. Site of lipid synthesis
C. Site of starch synthesis
D. Site of cellulose synthesis
Question 10
The diagram below shows the structure of a mitochondrion. Which of the following is NOT a function of the cristae?
A. Protein synthesis
B. Electron transport
C. ATP production
D. DNA replication
Question 11
In the context of excretion and osmoregulation, what is the primary function of the kidneys in the human body?
A. Regulation of blood pressure
B. Removal of waste products from the blood
C. Maintenance of electrolyte balance
D. Production of hormones
Question 12
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell?
A. The cell will shrink due to water loss.
B. The cell will swell due to water uptake.
C. The cell will remain unchanged.
D. The cell will burst due to osmotic pressure.
Question 13
A diagram of a plant's xylem is shown below. What is the function of the part labeled 'E'?
A. To transport water and minerals
B. To transport sugars and amino acids
C. To produce chlorophyll
D. To synthesize cellulose
Question 14
A 50g sample of a solution containing 20% glu\cose is diluted to 100ml. What is the concentration of glu\cose in the final solution?
A. 2%
B. 4%
C. 6%
D. 8%
Question 15
In the context of osmoregulation, what is the primary function of the antidiuretic hormone (ADH) in the kidneys?
A. Regulation of blood pressure
B. Maintenance of electrolyte balance
C. Promotion of water reabsorption in the collecting ducts
D. Stimulation of urine production

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