POST UTME LASU 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1600
B. 3200
C. 6400
D. 12800
Question 2
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. 0.16
D. 0.04
Question 3
A diagram of the human eye is shown below. Which of the following statements is true regarding the structure of the eye?
A. The cornea is the transparent part of the eye
B. The iris is the colored part of the eye
C. The lens is the part of the eye that changes shape to focus light
D. The retina is the part of the eye that detects light
Question 4
The process of mitosis results in what type of cell division?
A. Meiosis
B. Mitosis
C. Binary fission
D. Endoreduplication
Question 5
A bacterium divides every 20 minutes. If the initial population is 1000 cells, how many cells will be present after 5 generations?
A. 3125000
B. 6250000
C. 12500000
D. 25000000
Question 6
A 2-year-old child has a hemoglobin level of 10 g/dL. What is the percentage of the child's expected hemoglobin level?
A. 50%
B. 60%
C. 70%
D. 80%
Question 7
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 dominant allele 'A'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 8
A 5-year-old child is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid tyro\sine. Which of the following enzymes is deficient in this disorder?
A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase
Question 9
A plant with a genotype of BBRR is crossed with a plant with a genotype of bbrr. What is the probability that the offspring will have a genotype of BbRr?
A. 0.25
B. 0.5
C. 0.75
D. 0.875
Question 10
A 2-year-old child is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid phenylalanine. Which of the following enzymes is deficient in this disorder?
A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase
Question 11
The human eye has what type of photoreceptor cells that are sensitive to light intensity?
A. Bipolar cells
B. Ganglion cells
C. Rod cells
D. Cones cells
Question 12
A 2.5 L solution of 0.5 M NaCl has a pH of 7. If the solution is diluted to 5 L, what is the new pH?
A. 6.5
B. 7
C. 7.5
D. 8
Question 13
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. 0.64
B. 0.36
C. 0.16
D. 0.04
Question 14
A cell is placed in a solution with a pH of 5.5. What is the concentration of hydrogen ions in this solution?
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 15
A study on the genetics of height in a population of 1000 individuals found that the mean height was 175 cm with a s\tandard deviation of 5 cm. If the population follows a normal distribution, what is the probability that a randomly selected individual will be taller than 180 cm?
A. 0.1587
B. 0.3413
C. 0.5
D. 0.8413

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