POST UTME OAU 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP from NADH and FADH2
B. To produce water from oxygen and electrons
C. To synthesize glu\cose from CO2 and H2O
D. To reduce NAD+ to NADH
Question 2
A patient has a genetic disorder caused by a mutation in the HBB gene. Which of the following is a possible consequence of this mutation?
A. Sickle cell anemia
B. Thalassemia
C. Hemophilia
D. Cystic fibrosis
Question 3
A bio\logist is studying the structure of a plant cell. Which of the following is a characteristic of the cell wall?
A. Provides structural support to the cell
B. Regulates the movement of materials in and out of the cell
C. Contains the genetic material of the cell
D. Involved in the process of photosynthesis
Question 4
In a desert e\cosystem, the primary consumers are mostly insects that feed on the primary producers. What is the likely effect of a decrease in the primary producer population on the primary consumer population?
A. Increased primary consumer population
B. Decreased primary consumer population
C. No effect on primary consumer population
D. Increased decomposition
Question 5
In a coral reef e\cosystem, the primary producers are mostly algae that live on the coral. What is the likely effect of a decrease in the coral population on the primary producer population?
A. Increased primary producer population
B. Decreased primary producer population
C. No effect on primary producer population
D. Increased decomposition
Question 6
A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?
A. 0.5 m
B. 1.0 m
C. 1.5 m
D. 2.0 m
Question 7
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.5
B. 0.25
C. 0.75
D. 0.33
Question 8
A researcher is studying the effects of temperature on enzyme activity. Which of the following enzymes is most likely to be affected by a change in temperature?
A. Amylase
B. Lactase
C. Pep\sin
D. Tryp\sin
Question 9
In the context of eco\logy, what is the primary function of a keystone species?
A. To maintain the population size of other species
B. To regulate the food chain and maintain e\cosystem balance
C. To provide shelter and habitat for other species
D. To pollinate plants and facilitate seed dispersal
Question 10
A scientist is studying the effect of pH on the growth of E. coli bacteria. Which of the following is a likely outcome?
A. Increased growth at higher pH
B. Decreased growth at lower pH
C. No effect of pH on growth
D. Increased growth at lower pH
Question 11
A genetic cross is performed between two organisms with the following genotypes: F1 = AaBb and F2 = AaBb x aaBB. What is the probability of the offspring being homozygous recessive?
A. 1/4
B. 1/2
C. 3/4
D. 3/8
Question 12
In a population of rabbits, the frequency of the dominant allele 'B' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype?
A. 0.04
B. 0.16
C. 0.36
D. 0.64
Question 13
In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
A. To form the spindle fibers
B. To organize the chromosomes
C. To separate the sister chromatids
D. To initiate DNA replication
Question 14
A species of fish has a body length of 0.5 meters. If the fish is swimming at a speed of 2 m/s, what is the frequency of the fish's tailbeats per second?
A. 1.33
B. 2.0
C. 2.5
D. 3.0
Question 15
In a study on the effect of pH on the activity of the enzyme lactase, the following data were collected:
A. pH 7
B. pH 4
C. pH 10
D. pH 12

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