POST UTME COVENANT UNIVERSITY 2023 Biology | Objective
Practice these randomly selected questions to test your readiness.
Question 1
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7. If the pH of the medium is increased to 8, what is the expected effect on the growth of the microorganism?
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'?
Question 3
A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 50 N/m. The block is displaced by 0.1 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the period of the block?
Question 4
In the context of hormonal coordination, which of the following hormones is responsible for stimulating the release of insulin from the pancreas?
Question 5
A solution containing 0.1 M NaCl and 0.1 M glu\cose is separated from a solution containing 0.1 M NaOH and 0.1 M HCl by a semipermeable membrane. What is the direction of net movement of water across the membrane?
Question 6
A 10 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 5 mL of HCl?
Question 7
A researcher is studying the effect of pH on the growth of a specific type of bacteria. The researcher measures the growth rate at different pH levels and plots the data on a graph. Which of the following types of graphs would be most appropriate for this data?
Question 8
A researcher is studying the effect of temperature on the growth rate of E. coli. The researcher measures the growth rate at different temperatures and plots the data on a graph. Which of the following types of graphs would be most appropriate for this data?
Question 9
A diagram of a simple e\cosystem is shown below. Identify the primary producer.
Question 10
A plant is placed in a sealed container with a mixture of oxygen and nitrogen gases. If the plant undergoes respiration, what will be the effect on the concentration of oxygen in the container?
Question 11
The diagram below shows the life cycle of a bacterium. Which stage is responsible for the production of spores?
Question 12
A researcher is studying the effect of temperature on the rate of respiration in yeast. The researcher measures the rate of respiration at different temperatures and obtains the following data: 25°C: 2.5 mmol/min, 30°C: 4.0 mmol/min, 35°C: 5.5 mmol/min. What is the activation energy of the reaction?
Question 13
A patient is suffering from a severe case of dehydration and is administered a solution of glu\cose and water. If the patient's blood glu\cose level is 100 mg/dL and the solution contains 5% glu\cose, what will be the effect on the patient's blood glu\cose level after 1 hour?
Question 14
A stream flows through a river and carries with it a mixture of nutrients and sediments. If the stream is polluted with a high concentration of nutrients, what will be the effect on the growth of aquatic plants?
Question 15
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 dominant allele 'R'?
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