POST UTME NILE UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a human eye is shown below. What is the function of the retina?
A. B\ending of light
B. Detection of light
C. Production of tears
D. Regulation of pupil size
Question 2
The diagram below shows a simplified representation of the human nervous system. Which part of the nervous system is responsible for controlling voluntary movements?
A. Brain
B. Spinal Cord
C. Peripheral Nervous System
D. Central Nervous System
Question 3
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following statements about microbial growth is TRUE?
A. The growth rate of a microorganism is directly proportional to the temperature.
B. The growth rate of a microorganism is inversely proportional to the temperature.
C. The growth rate of a microorganism is unaffected by the temperature.
D. The growth rate of a microorganism is maximum at a temperature of 20°C.
Question 4
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following would be the most appropriate way to express the relationship between pH and enzyme activity?
A. pH = k * \( 1 / \( 1 + (K_m / [S] \ \))
B. V = k * [S] / \( K_m + [S] \)
C. pH = k * \( 1 / \( 1 + ([S] / K_m \ \)))
D. V = k * \( 1 / \( 1 + (K_m / [S] \ \)))
Question 5
A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing most of the water and electrolytes from the chyme?
A. Stomach
B. Small intestine
C. Large intestine
D. Liver
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. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 7
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH
Question 8
In the xylem, water and minerals are transported from the roots to the leaves through a process called the
A. transpiration stream
B. osmotic gradient
C. capillary action
D. root pressure
Question 9
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic recombination
B. Mutation
C. Gene flow
D. Genetic drift
Question 10
A patient has been diagnosed with a bacterial infection. Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
D. Vancomycin
Question 11
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. 0.25
B. 0.5
C. 0.75
D. 1
Question 12
A population of rabbits is growing according to the \logistic growth equation: dP/dt = rP\( 1 - P/K \). If the initial population is 100 and the carrying capacity is 1000, what is the population after 5 years?
A. 200
B. 500
C. 800
D. 1000
Question 13
A species of plant has a photosynthetic rate of 10 mg CO2/h. If the plant is exposed to light for 8 hours, what is the total amount of CO2 fixed?
A. 80 mg
B. 100 mg
C. 120 mg
D. 140 mg
Question 14
The process of evolution that occurs when a new species emerges from a \single individual is called?
A. Speciation
B. Adaptation
C. Mutation
D. Genetic Drift
Question 15
The process of cell division that results in the production of four daughter cells, each with the same number of chromosomes as the parent cell, is called?
A. Mitosis
B. Meiosis
C. Binary Fission
D. Endosymbiosis

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