POST UTME BELLS UNIVERSITY 2023 Biology | Objective

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Question 1 View Details
In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled between organisms?
Correct A. Decomposition
B. Photosynthesis
C. Respiration
D. Transpiration

Correct Answer: A

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Question 2 View Details
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?
Correct 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

Correct Answer: A

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Question 3 View Details
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
Correct D. Species

Correct Answer: D

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Question 4 View Details
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
Correct D. Reduced energy exp\enditure

Correct Answer: D

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Question 5 View Details
A diagram of a typical eukaryotic cell is shown below. What is the function of the structure labeled 'X'?
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Endoplasmic reticulum

Correct Answer: C

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Question 6 View Details
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
Correct A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Water

Correct Answer: A

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Question 7 View Details
The xylem in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is responsible for transporting sugars
C. It is composed of living cells
Correct D. It is responsible for transporting water and minerals

Correct Answer: D

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Question 8 View Details
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
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 9 View Details
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
Correct C. Tryp\sin
D. Lactase

Correct Answer: C

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Question 10 View Details
The process of evolution in living organisms involves the change in the frequency of certain traits over time. Which of the following is a mechanism of evolution?
A. Mutation
B. Genetic drift
Correct C. Natural selection
D. Gene flow

Correct Answer: C

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Question 11 View Details
In a population of E. coli, the average generation time is 30 minutes. If the population is doubling every 2 hours, what is the rate of increase per minute?
Correct A. 0.05
B. 0.1
C. 0.2
D. 0.5

Correct Answer: A

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Question 12 View Details
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 0.5 m/s
Correct B. 1 m/s
C. 1.5 m/s
D. 2 m/s

Correct Answer: B

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Question 13 View Details
A 1500 mL sample of a solution containing 0.1 M NaCl is diluted to a total volume of 3000 mL. What is the concentration of NaCl in the final solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 14 View Details
A 0.5 L sample of a 0.2 M solution of HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 15 View Details
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?
Correct A. C2H4O
B. C3H6O
C. C4H8O
D. C5H10O

Correct Answer: A

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Question 16 View Details
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is mediated by the action of which of the following proteins?
A. Lamin B
B. Histone H2B
C. Conden\sin
Correct D. Topoisomerase II

Correct Answer: D

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Question 17 View Details
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?
Correct A. Xylem
B. Phloem
C. Cortex
D. Endodermis

Correct Answer: A

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Question 18 View Details
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?
Correct A. Michaelis-Menten kinetics
B. Enzyme inhibition
C. Competitive inhibition
D. Non-competitive inhibition

Correct Answer: A

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Question 19 View Details
The diagram below shows a cross-section of a human eye. Which of the following structures is responsible for the accommodation of light entering the eye?
A. Cornea
B. Iris
Correct C. Lens
D. Retina

Correct Answer: C

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Question 20 View Details
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
Correct B. Enzyme inhibition
C. Competitive inhibition
D. Non-competitive inhibition

Correct Answer: B

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Question 21 View Details
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
Correct B. 0.64
C. 0.72
D. 0.84

Correct Answer: B

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Question 22 View Details
A 2.5-mL sample of 0.1 M HCl is added to a 50-mL sample of 0.1 M NaOH in a burette. If the initial burette reading is 25.0 mL, what is the final burette reading?
A. 30.0
Correct B. 32.5
C. 35.0
D. 37.5

Correct Answer: B

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Question 23 View Details
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
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 24 View Details
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?
A. 25.0
Correct B. 30.0
C. 35.0
D. 40.0

Correct Answer: B

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Question 25 View Details
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
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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