POST UTME ELIZADE UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 L flask contains a mixture of O2 and N2 gases at a total pressure of 2.0 atm. If the partial pressure of O2 is 0.8 atm, what is the mole \fraction of N2?
A. 0.4
B. 0.6
C. 0.7
D. 0.8
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'?
A. 0.36
B. 0.64
C. 0.48
D. 0.52
Question 3
A person with a diet high in sugar and low in fiber is at risk for developing which of the following diseases?
A. Diabetes
B. Heart disease
C. Cancer
D. All of the above
Question 4
A 10 mL sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 5
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP
B. To produce NADH and FADH2
C. To oxidize glu\cose
D. To reduce oxygen
Question 6
A nerve impulse travels down a motor neuron at a speed of 120 m/s. If the neuron is 2.5 cm long, how long does it take for the impulse to reach the \end of the neuron?
A. 0.02 s
B. 0.05 s
C. 0.1 s
D. 0.2 s
Question 7
A plant grows in a pot with a mixture of 70% sand, 20% silt, and 10% clay. If the plant's roots absorb 50% of the water in the pot, what is the percentage of water absorbed by the sand?
A. 35%
B. 40%
C. 45%
D. 50%
Question 8
The process of digestion in the small intestine involves the action of
A. Amylase
B. Lactase
C. Tryp\sin
D. All of the above
Question 9
A genetic cross between two pea plants shows a 3:1 ratio of tall to short plants. What is the genotype of the short plants?
A. Tt
B. tt
C. TT
D. T
Question 10
A nerve cell has a resting potential of -70 mV. If the cell is stimulated to fire, the membrane potential changes to +30 mV. What is the total change in membrane potential?
A. +100 mV
B. +50 mV
C. +30 mV
D. +20 mV
Question 11
A diagram of the human circulatory system is shown below. Which part of the system is responsible for the transport of oxygen to the body's tissues?
A. Arteries
B. Veins
C. Capillaries
D. Heart
Question 12
A 2.5 L flask contains 0.5 M HCl. If 1.5 L of 0.5 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 13
In a population of 1000 individuals, 200 are heterozygous for a particular gene. What is the frequency of the dominant allele in this population?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 14
The xylem in plants is responsible for transporting
A. water and minerals
B. sugars and amino acids
C. oxygen and carbon dioxide
D. nutrients and hormones
Question 15
Asexual reproduction in plants can occur through the production of
A. seeds
B. spores
C. buds
D. rhizomes

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