POST UTME RSU 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effects of pollution on a freshwater e\cosystem. Which of the following types of eco\logical cycles would be most relevant to this study?
A. Water cycle
B. Carbon cycle
C. Nitrogen cycle
D. Phosphorus cycle
Question 2
The genetic code is a set of rules that translates nucleotide sequences into
A. Proteins
B. DNA
C. RNA
D. Genes
Question 3
A researcher is studying the effects of light intensity on plant growth. Which of the following types of eco\logical communities would be most relevant to this study?
A. Desert e\cosystem
B. Tropical rainforest
C. Grassland
D. Alpine meadow
Question 4
A 2.5 L flask contains 0.5 M HCl. If 0.1 g of NaOH is added to the solution, what is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.5 M solution of HCl is prepared by dissolving 25 g of HCl in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
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 7
A 2.5-liter flask contains 1.5 liters of oxygen gas at 25°C and 1 atm. If 0.5 liters of oxygen gas is removed, what is the new partial pressure of oxygen in the flask?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.25 atm
Question 8
A cell undergoing mitosis has a DNA content of 6.0 pg. If the DNA content of a cell in G1 phase is 3.0 pg, what is the DNA content of the cell after one round of S phase?
A. 3.0 pg
B. 4.5 pg
C. 6.0 pg
D. 9.0 pg
Question 9
A 50-gram sample of a subs\tance is dissolved in 100 milliliters of water. If the solution has a pH of 4.5, what is the concentration of hydrogen ions in the solution?
A. 10^-4 M
B. 10^-5 M
C. 10^-6 M
D. 10^-7 M
Question 10
The diagram below shows the structure of a plant cell. Which part is responsible for photosynthesis?
A. Vacuole
B. Mitochondrion
C. Chloroplast
D. Nucleus
Question 11
A diagram of a simple harmonic motion is shown below. Identify the point on the graph where the object is at rest.
A. (0, 0)
B. (1, 0)
C. (2, 0)
D. (3, 0)
Question 12
A 5.0 g sample of a mixture of NaCl and KCl is analyzed by flame photometry. If the amount of sodium detected is 2.5 g and the amount of potassium detected is 1.0 g, what is the percentage composition of the mixture?
A. NaCl: 60%, KCl: 40%
B. NaCl: 40%, KCl: 60%
C. NaCl: 50%, KCl: 50%
D. NaCl: 30%, KCl: 70%
Question 13
In a study on the effect of temperature on the growth of E. coli, the following data were collected:
A. y = 2x + 1
B. y = 3x - 2
C. y = 4x + 3
D. y = 5x - 1
Question 14
A 10 mL sample of a 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the pH of the solution at the equivalence point is 8.5, what is the value of Ka for the acid?
A. 1.0 x 10^-5
B. 1.0 x 10^-6
C. 1.0 x 10^-7
D. 1.0 x 10^-8
Question 15
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. A
B. B
C. C
D. D

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