POST UTME UNILAG 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effects of a new medication on the cardiovascular system. The medication is designed to lower blood pressure by reducing the amount of sodium in the bloodstream. What is the primary mechanism by which the medication exerts its effect?
A. inhibition of the renin-angioten\sin-aldosterone system
B. inhibition of the sympathetic nervous system
C. activation of the parasympathetic nervous system
D. increased excretion of sodium in the urine
Question 2
A researcher is studying the effects of a new medication on the respiratory system. The medication is designed to reduce inflammation in the lungs. What is the primary mechanism by which the medication exerts its effect?
A. inhibition of the cyclooxygenase enzyme
B. inhibition of the lipoxygenase enzyme
C. activation of the parasympathetic nervous system
D. increased production of surfac\tant
Question 3
A patient is diagnosed with a bacterial infection caused by Escherichia coli. The patient is prescribed a course of antibiotics, which includes a combination of ampicillin and gentamicin. What is the mechanism by which ampicillin exerts its bactericidal effect?
A. inhibition of cell wall synthesis
B. inhibition of protein synthesis
C. interference with DNA replication
D. activation of the host immune response
Question 4
A researcher is studying the population dynamics of a species of rabbit in a controlled environment. The rabbit population grows according to the \logistic growth model, which is described by the differential equation dP/dt = rP\( 1 - P/K \), where P is the population size, r is the intrinsic growth rate, and K is the carrying capacity. If the initial population size is 100, the intrinsic growth rate is 0.5, and the carrying capacity is 1000, what is the population size at time t = 10?
A. 500
B. 750
C. 900
D. 950
Question 5
The process of mitosis is shown below. What is the stage of mitosis where the chromosomes are condensed and attached to the spindle fibers?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 6
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Active transport
B. Passive diffusion
C. Osmosis
D. Filtration
Question 7
A researcher is studying the effect of pH on the activity of the enzyme lactase. If the pH of the solution is increased from 4.5 to 5.5, what is the expected effect on the activity of the enzyme?
A. decrease
B. increase
C. no effect
D. variable
Question 8
A species of bacteria has a generation time of 2 hours. If the population size is 10^6, what is the rate of increase per hour?
A. 0.001
B. 0.01
C. 0.1
D. 1.0
Question 9
A plant with the genotype AaBb is crossed with a plant with the genotype AaBb. What is the probability that the offspring will have the genotype AaBb?
A. 0.25
B. 0.50
C. 0.75
D. 0.90
Question 10
In the context of genetics, what is the primary function of the centriole in the cell?
A. To form the spindle fibers during cell division
B. To synthesize the genetic material during DNA replication
C. To regulate the cell cycle
D. To produce the flagella in eukaryotic cells
Question 11
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To synthesize proteins
D. To store genetic information
Question 12
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
B. 0.64
C. 0.72
D. 0.80
Question 13
What is the process by which plants convert light energy into chemical energy?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation
Question 14
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'A'?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis
Question 15
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the blood type. If 20% of the population are type A, 40% are type B, and 30% are type AB, what is the probability that a randomly selected individual is type O?
A. 0.05
B. 0.10
C. 0.15
D. 0.20

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