POST UTME CHRISTOPHER UNIVERSITY 2018 Biology | Objective
Practice these randomly selected questions to test your readiness.
Question 1
A 10 mL sample of a 0.5 M NaCl solution is diluted to 50 mL. What is the concentration of NaCl in the resulting solution?
Question 2
In a population of 1000 individuals, 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'?
Question 3
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
Question 4
A cell is in the G2 phase of the cell cycle. If the cell is to divide in 2 hours, what is the rate of DNA replication (r) in the equation N(t) = N0 * e^(rt)?
Question 5
A diagram of a plant cell is shown below. Identify the part labeled 'X'.
Question 6
A researcher is studying the effect of pH on the growth of a microorganism. The growth rate is measured in terms of the specific growth rate (μ) in the equation dN/dt = μN. If the growth rate is 0.5 h^-1 at pH 7 and 0.2 h^-1 at pH 5, what is the value of the Hill coefficient (n) in the equation μ = μmax * \( H^\( -n \ \))?
Question 7
A patient is diagnosed with a rare genetic disorder that affects the production of melanin. The patient's skin is pale and they have a high risk of skin cancer. Which of the following is the most likely cause of the patient's condition?
Question 8
A researcher is studying the effect of oxygen levels on the growth of a microorganism. The growth rate is measured in terms of the specific growth rate (μ) in the equation dN/dt = μN. If the growth rate is 0.5 h^-1 at 10% oxygen and 0.2 h^-1 at 5% oxygen, what is the value of the half-saturation cons\tant (Ks) in the equation μ = μmax * \( S / \( Ks + S \ \))?
Question 9
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
Question 10
In a food chain, a producer is consumed by a primary consumer, which is then consumed by a secondary consumer. If the producer produces 100 units of energy, how much energy is transferred to the secondary consumer?
Question 11
The diagram below shows a cross-section of a plant root. What is the function of the structure labeled 'A'?
Question 12
A 2.5 cm long root hair cell is placed in a solution with a concentration of 0.1 M KCl. If the cell membrane is selectively permeable to K+ ions, what is the concentration of K+ ions inside the cell after 10 minutes?
Question 13
In a population of E. coli bacteria, the average generation time is 30 minutes. If the population is doubling every 2 hours, what is the growth rate cons\tant (r) in the exponential growth equation P(t) = P0 * e^(rt)?
Question 14
A patient with a rare genetic disorder has a mutation in the HBB gene, which codes for the \beta-globin subunit of hemoglobin. The mutation results in a substitution of glutamic acid for valine at position 6 of the \beta-globin protein. Which of the following is the most likely effect of this mutation on the structure and function of hemoglobin?
Question 15
A cell is in the M phase of the cell cycle. If the cell is to divide in 1 hour, what is the rate of mitosis (r) in the equation N(t) = N0 * e^(rt)?
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