POST UTME BELLS UNIVERSITY 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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. 0.84
Question 2
A species of bird has a unique mating ritual where the male presents the female with a specific type of food. What is the primary function of this behavior?
A. To establish dominance over other males
B. To attract a mate and increase reproductive success
C. To def\end territory from other birds
D. To communicate with other birds about food sources
Question 3
A diagram of a plant's xylem and phloem tissues is shown below. What is the function of the xylem tissue?
A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Storage of starch and proteins
D. Synthesis of ATP
Question 4
A diagram of a human respiratory system is shown below. What is the function of the alveoli?
A. Exchange of oxygen and carbon dioxide
B. Filtering of dust and debris
C. Production of mucus
D. Regulation of body temperature
Question 5
A patient with a severe case of kidney failure is being treated with a dialysis machine. The machine is designed to remove waste products from the blood u\sing a process called diffusion. Which of the following is the most likely mechanism of diffusion in this process?
A. Passive diffusion
B. Facilitated diffusion
C. Active transport
D. Osmosis
Question 6
The classification of living things is based on the following characteristics: cell structure, metabolism, response to stimuli, and genetic makeup. What is the primary characteristic used to classify prokaryotic cells?
A. Cell structure
B. Metabolism
C. Response to stimuli
D. Genetic makeup
Question 7
The process of evolution is driven by the accumulation of genetic mutations over time. Which of the following is a key mechanism of evolution?
A. Natural Selection
B. Genetic Drift
C. Mutation
D. Gene Flow
Question 8
A population of rabbits is growing at a rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 5 years?
A. 1000
B. 1200
C. 1500
D. 2000
Question 9
A diagram of a human respiratory system is shown below. Which part of the system is responsible for the exchange of oxygen and carbon dioxide?
A. Trachea
B. Lungs
C. Diaphragm
D. Bronchi
Question 10
A species of bacteria is classified as a Gram-positive, aerobic, rod-shaped bacterium that is capable of producing spores. Which of the following genera is most likely to be the correct classification for this bacterium?
A. Bacillus
B. Clostridium
C. Staphylococcus
D. Escherichia
Question 11
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. What is the byproduct of this process?
A. Glu\cose and oxygen
B. Glu\cose and carbon dioxide
C. Oxygen and carbon dioxide
D. Water and glu\cose
Question 12
A patient with a severe case of tuberculosis (TB) is being treated with a combination of antibiotics. The patient's sputum is cultured on a medium that contains a selective agent to inhibit the growth of other bacteria. Which of the following is the most likely selective agent used in this medium?
A. Piperacillin
B. Cycloserine
C. Polymyxin B
D. Cefotaxime
Question 13
What is the primary function of the xylem in plants?
A. Transport of sugars
B. Transport of water and minerals
C. Support and storage
D. Protection from pathogens
Question 14
A patient with a severe case of respiratory failure is being treated with a ventilator. The ventilator is designed to provide a cons\tant flow of oxygen to the lungs u\sing a process called positive pressure ventilation. Which of the following is the most likely mechanism of positive pressure ventilation in this process?
A. Inspiratory pressure
B. Expiratory pressure
C. Inspiratory flow
D. Expiratory flow
Question 15
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
B. Genetic recombination
C. Gene duplication
D. Gene deletion

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