POST UTME BELLS UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10-mL sample of 0.5 M glu\cose is added to a 50-mL sample of 0.1 M NaOH in a burette. If the initial burette reading is 20.0 mL, what is the final burette reading?
Question 2
The process of mitosis in cells involves the division of the nucleus into two daughter nuclei. Which of the following stages of mitosis is responsible for the separation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 3
The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. Xylem
B. Phloem
C. Cortex
D. Endodermis
Question 4
In the human body, what is the primary function of the xylem?
A. Transport of oxygen to the lungs
B. Transport of nutrients to the cells
C. Transport of water and minerals to the roots
D. Transport of waste products to the kidneys
Question 5
In a desert e\cosystem, the primary consumers are primarily insects and small reptiles. Which of the following is a characteristic of these organisms?
A. They have a high metabolic rate to cope with the hot temperatures.
B. They have a low metabolic rate to conserve energy.
C. They are primarily herbivores.
D. They are primarily carnivores.
Question 6
A species of bacteria is classified as belonging to the domain Bacteria, kingdom Bacteroidetes, phylum Bacteroidota, class Cytophagia, order Cytophagales, family Cytophagaceae, genus Cytophaga, and species C. hutchinsonii. What is the correct taxonomic rank for this species?
A. Domain
B. Kingdom
C. Phylum
D. Species
Question 7
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Regulation of hunger and thirst
C. Regulation of hormone secretion
D. Regulation of sleep-wake cycle
Question 8
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. 0.9
Question 9
In the context of excretion, what is the primary function of the kidneys?
A. Regulation of blood pressure
B. Regulation of electrolyte balance
C. Removal of waste products from the blood
D. Production of hormones
Question 10
A diagram of a typical eukaryotic cell is shown below. What is the function of the structure labeled 'X'?
A. Mitochondria
B. Chloroplast
C. Nucleus
D. Endoplasmic reticulum
Question 11
A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. The trachea
B. The bronchi
C. The alveoli
D. The diaphragm
Question 12
A patient with a rare genetic disorder has an inability to properly regulate water and electrolyte balance in the body. Which of the following best describes the underlying defect?
A. Mutations in the aquaporin-2 gene
B. Defects in the renin-angioten\sin-aldosterone system
C. Impaired function of the vasopres\sin receptor
D. Dysregulation of the hypothalamic-pituitary-adrenal axis
Question 13
The graph below shows the relationship between the concentration of a substrate and the rate of enzyme activity. Which of the following best describes the type of enzyme kinetics represented by this graph?
A. Michaelis-Menten kinetics
B. Enzyme inhibition
C. Competitive inhibition
D. Non-competitive inhibition
Question 14
A 2.0 g sample of a compound containing only C, H, and O is analyzed by combustion analysis. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.8 g. What is the empirical formula of the compound?
A. C2H4O
B. C3H6O
C. C4H8O
D. C5H10O
Question 15
Asexual reproduction in plants can occur through the production of adventitious roots. What is the primary advantage of this type of reproduction?
A. Increased genetic diversity
B. Faster growth rates
C. Improved resis\tance to disease
D. Reduced energy exp\enditure

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