POST UTME ESUT 2021 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 growth rate is 20% per hour, what will be the population after 3 hours?
A. 1600
B. 2000
C. 2400
D. 3000
Question 2
In the context of respiratory gas exchange, what is the primary function of the alveolar-capillary membrane?
A. To regulate gas exchange
B. To maintain blood pH
C. To control blood pressure
D. To facilitate immune response
Question 3
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Stimulation of the pituitary gland
C. Inhibition of the adrenal gland
D. Regulation of appetite
Question 4
A genetic disorder caused by a point mutation in the DNA sequence of a gene can result in a frameshift mutation. What is the primary effect of this type of mutation?
A. Insertion or deletion of amino acids
B. Substitution of amino acids
C. Silencing of gene expression
D. Activation of gene expression
Question 5
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 6
The nervous system of an organism is responsible for transmitting signals from sensory receptors to the brain. Which of the following types of neurons is primarily responsible for this function?
A. Motor neurons
B. Sensory neurons
C. Interneurons
D. Glial cells
Question 7
A 10.0 mL sample of 0.1 M HCl is mixed with a 10.0 mL sample of 0.1 M NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 8
A species of bird has a unique mating system where the male and female birds mate for life. What is the term for this type of mating system?
A. Monogamy
B. Polygyny
C. Polyandry
D. Promiscuity
Question 9
The diagram below shows a cross between two Drosophila melanogaster individuals. What is the probability that the offspring will be homozygous recessive for the gene 'a'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 10
The process of natural selection acts on the variation in a population to favor individuals with traits that are better suited to their environment. Which of the following is an example of a trait that would be favored by natural selection in a population of birds?
A. A larger beak size
B. A smaller beak size
C. A more vibrant plumage color
D. A longer wing length
Question 11
A population of Drosophila melanogaster has a frequency of the recessive allele 'a' of 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
A. 0.36
B. 0.64
C. 0.16
D. 0.04
Question 12
The diagram below shows a cross between two individuals with different genotypes for the gene 'a'. What is the probability that the offspring will be homozygous recessive for the gene 'a'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 13
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following is a characteristic of the primary consumers in this e\cosystem?
A. They have a high metabolic rate to quickly digest their food.
B. They have a slow reproductive rate due to the high competition for resources.
C. They are primarily carnivores that feed on the abundant insect life.
D. They have a large body size to store energy for long periods.
Question 14
A 10.0 mL sample of 0.1 M HCl is mixed with a 10.0 mL sample of 0.1 M NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 15
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. 0.84

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