POST UTME UNIPORT 2018 Biology | Objective

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Question 1
A diagram of a human eye is shown below. What is the function of the structure labeled 'Y'?
A. Regulation of light entry
B. Focus of light rays
C. Production of tears
D. Maintenance of eye pressure
Question 2
A diagram of a plant cell is shown below. Which of the following organelles is responsible for photosynthesis?
A. A
B. B
C. C
D. D
Question 3
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Storage of water and nutrients
B. Synthesis of proteins
C. Production of energy
D. Regulation of cell growth
Question 4
The diagram below represents a cross-section of a human eye. Which of the following structures is responsible for adjusting the shape of the lens?
A. Retina
B. Lens
C. Ciliary muscle
D. Iris
Question 5
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this bacterium?
A. Penicillin
B. Erythromycin
C. Vancomycin
D. Tetracycline
Question 6
A genetic cross is performed between two pea plants, one with the genotype TT and the other with the genotype tt. What is the probability that the offspring will have the genotype Tt?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 7
The diagram below shows a cross between two Drosophila melanogaster individuals. What is the probability that the offspring will be homozygous dominant?
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 8
A 20% glu\cose solution is prepared by dissolving 20g of glu\cose in 100g of water. What is the concentration of the solution in g/dL?
A. 20g/100mL
B. 20g/100g
C. 20g/dL
D. 20g/100mL
Question 9
A 50 kg person is s\tanding on a scale in a elevator. If the elevator accelerates upward at 2 m/s^2, what is the reading on the scale?
A. 550 N
B. 600 N
C. 650 N
D. 700 N
Question 10
A diagram of a human eye is shown below. Which of the following structures is responsible for detecting light?
A. A
B. B
C. C
D. D
Question 11
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 12
The diagram below represents the structure of a plant cell. Which of the following organelles is responsible for protein synthesis?
A. Mitochondria
B. Nucleus
C. Ribosome
D. Lysosome
Question 13
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 recessive genotype 'rr'?
A. 0.04
B. 0.16
C. 0.24
D. 0.36
Question 14
A population of bacteria is growing exponentially. If the initial population is 100 and the growth rate is 20% per hour, what will be the population after 3 hours?
A. 1600
B. 2000
C. 2500
D. 3000
Question 15
A genetic disorder caused by a mutation in the HBB gene leads to a substitution of glutamic acid for valine at position 6 of the \beta-globin chain. What is the likely effect on the protein structure?
A. The protein will be more stable and have a longer half-life
B. The protein will be less stable and have a shorter half-life
C. The protein will have a change in its secondary structure
D. The protein will have a change in its tertiary structure

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