POST UTME NILE UNIVERSITY 2018 Biology | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
Correct A. 200
B. 400
C. 600
D. 800

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 3
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what is the population size after 3 hours?
A. 2200
B. 2400
Correct C. 2600
D. 2800

Correct Answer: C

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Question 4
A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients?
A. Mouth
B. Esophagus
C. Stomach
Correct D. Small Intestine

Correct Answer: D

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Question 5
A study on the effect of pH on the growth of a microorganism found that the growth rate is highest at pH 7. If the pH of the medium is 5, what is the expected growth rate?
Correct A. 0.5
B. 0.6
C. 0.7
D. 0.8

Correct Answer: A

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Question 6
In a population of 1000 individuals, 80% are homozygous dominant (BB), 15% are heterozygous (Bb), and 5% are homozygous recessive (bb). What is the frequency of the recessive allele (b) in this population?
Correct A. 0.05
B. 0.10
C. 0.15
D. 0.20

Correct Answer: A

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Question 7
A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell proceeds to mitosis, what will be the DNA content of the daughter cells?
Correct A. 4C
B. 8C
C. 16C
D. 32C

Correct Answer: A

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Question 8
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Nucleus
B. Mitochondria
C. Cell wall
D. Chloroplast

Correct Answer: A

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Question 9
A patient has a blood type of AB positive. If the patient receives a blood transfusion from a donor with blood type O negative, what will be the outcome?
A. The patient's body will reject the transfused blood.
B. The patient's body will accept the transfused blood.
C. The patient's body will have a mild reaction to the transfused blood.
Correct D. The patient's body will have a severe reaction to the transfused blood.

Correct Answer: D

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Question 10
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
Correct B. Iris
C. Retina
D. Lens

Correct Answer: B

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Question 11
In the context of sense organs, what is the primary function of the olfactory epithelium?
A. To detect changes in air pressure
B. To convert sound waves into electrical signals
Correct C. To detect odor molecules in the air
D. To regulate body temperature

Correct Answer: C

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Question 12
A researcher is studying the effects of antibiotics on bacterial growth. Which of the following statements is true about the mode of action of antibiotics?
A. Antibiotics inhibit protein synthesis by binding to the 30S subunit of the ribosome
Correct B. Antibiotics disrupt cell wall synthesis by inhibiting the enzyme transpeptidase
C. Antibiotics interfere with DNA replication by binding to the enzyme DNA polymerase
D. Antibiotics alter membrane permeability by disrupting the cell membrane

Correct Answer: B

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Question 13
A 25-year-old male patient presents with symptoms of malabsorption. Which of the following conditions is most likely responsible for his symptoms?
Correct A. Celiac disease
B. Crohn's disease
C. Ulcerative colitis
D. Whipple's disease

Correct Answer: A

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Question 14
A 35-year-old female patient is diagnosed with a genetic disorder that affects her ability to metabolize certain amino acids. Which of the following enzymes is most likely deficient in her condition?
Correct A. Phenylalanine hydroxylase
B. Tyro\sinase
C. Histidine decarboxylase
D. Tryptophan hydroxylase

Correct Answer: A

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Question 15
A researcher is studying the effects of a new drug on the growth of cancer cells. Which of the following statements is true about the mode of action of the drug?
A. The drug inhibits cell division by binding to the enzyme DNA polymerase
B. The drug disrupts cell membrane permeability by altering the expression of certain genes
Correct C. The drug interferes with protein synthesis by binding to the 40S subunit of the ribosome
D. The drug alters DNA replication by inhibiting the enzyme topoisomerase

Correct Answer: C

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Question 16
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number and kind of chromosomes as the parent cell, is known as
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication

Correct Answer: A

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Question 17
The process by which plants convert light energy into chemical energy is known as
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Translocation

Correct Answer: B

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Question 18
The part of the eye that is responsible for detecting light and color is the
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 19
The process by which microorganisms cause disease in humans is known as
Correct A. Infection
B. Contamination
C. Toxicity
D. Allergenicity

Correct Answer: A

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Question 20
The diagram below shows the structure of a plant cell. Identify the part labeled A
Correct A. Cell Wall
B. Cytoplasm
C. Nucleus
D. Mitochondria

Correct Answer: A

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'rr'?
Correct A. 0.04
B. 0.16
C. 0.24
D. 0.32

Correct Answer: A

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Question 22
A 10-year-old child is diagnosed with a rare genetic disorder that affects the production of melanin. Which of the following is a likely consequence of this disorder?
Correct A. Albinism
B. Vitiligo
C. Melasma
D. Hyperpigmentation

Correct Answer: A

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Question 23
A researcher is studying the effect of pH on the growth of E. coli. The researcher observes that the bacteria grow best at a pH of 7.0. What is the likely reason for this observation?
Correct A. The bacteria have an optimal pH for growth
B. The bacteria are sensitive to acidic environments
C. The bacteria are sensitive to alkaline environments
D. The bacteria have a unique mechanism for pH regulation

Correct Answer: A

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Question 24
A 30-year-old woman is diagnosed with a rare genetic disorder that affects the production of collagen. Which of the following is a likely consequence of this disorder?
Correct A. Ehlers-Danlos syndrome
B. Osteogenesis imperfecta
C. Marfan syndrome
D. Scurvy

Correct Answer: A

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Question 25
A researcher is studying the effect of temperature on the growth of yeast. The researcher observes that the yeast grow best at a temperature of 30°C. What is the likely reason for this observation?
Correct A. The yeast have an optimal temperature for growth
B. The yeast are sensitive to high temperatures
C. The yeast are sensitive to low temperatures
D. The yeast have a unique mechanism for temperature regulation

Correct Answer: A

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