Practice Post UTME UNILORIN biology 2022 Past Questions

Question 1 View Details

In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, what is the expected number of resis\tant bacteria?

A. 160

B. 200

Correct C. 240

D. 280

Correct Answer: C

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Question 2 View Details

A diagram of the human eye is shown below. What is the function of the part labeled 'A'?

Correct A. To focus light on the retina

B. To detect light intensity

C. To regulate pupil size

D. To produce tears

Correct Answer: A

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Question 3 View Details

A plant has a root system that consists of 50% primary roots and 50% secondary roots. If the plant has 1000 roots, how many of them are secondary roots?

A. 500

Correct B. 750

C. 1000

D. 1250

Correct Answer: B

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Question 4 View Details

A diagram of the human kidney is shown below. What is the function of the part labeled 'B'?

Correct A. To filter waste from the blood

B. To regulate blood pressure

C. To produce hormones

D. To store urine

Correct Answer: A

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Question 5 View Details

A diagram of the human respiratory system is shown below. What is the function of the part labeled 'C'?

Correct A. To exchange oxygen and carbon dioxide

B. To regulate body temperature

C. To produce mucus

D. To detect odors

Correct Answer: A

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Question 6 View Details

In a eukaryotic cell, the process of cytokinesis is initiated by the contraction of which of the following structures?

A. Microtubules

Correct B. Microfilaments

C. Intermediate filaments

D. Mitochondria

Correct Answer: B

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Question 7 View Details

The process by which the genetic information in a DNA molecule is copied to a new molecule of DNA is known as?

A. Transcription

B. Translation

Correct C. Replication

D. Transduction

Correct Answer: C

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Question 8 View Details

The diagram below shows a cross-section of a plant root. Identify the structure labeled 'A'?

A. Xylem

B. Phloem

Correct C. Cortex

D. Endodermis

Correct Answer: C

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Question 9 View Details

The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if?

A. There is no mutation

B. There is no gene flow

C. There is no genetic drift

Correct D. All of the above

Correct Answer: D

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Question 10 View Details

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the structure labeled 'B'?

A. Beaker

Correct B. Burette

C. Conical flask

D. Pipette

Correct Answer: B

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Question 11 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'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.88

Correct Answer: A

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Question 12 View Details

A plant cell has a cell wall composed of cellulose, hemicellulose, and pectin. Which of the following is NOT a primary function of the cell wall?

A. Support and protection

Correct B. Storage of nutrients

C. Transport of water and minerals

D. Regulation of cell growth

Correct Answer: B

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Question 13 View Details

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. Trachea

B. Bronchi

Correct C. Lungs

D. Diaphragm

Correct Answer: C

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Question 14 View Details

A genetic cross is performed between two pea plants, one with the genotype 'Rr' and the other with the genotype 'rr'. What is the probability that the offspring will have the genotype 'RR'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1.0

Correct Answer: A

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Question 15 View Details

A diagram of the human digestive system is shown below. Which of the following structures is responsible for the breakdown of proteins?

A. Mouth

Correct B. Stomach

C. Small intestine

D. Pancreas

Correct Answer: B

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Question 16 View Details

In a population of 1000 bacteria, 80% are susceptible to antibiotic treatment, 15% are resis\tant, and 5% are in a latent state. If 200 bacteria are treated with an antibiotic, what is the expected number of bacteria that will be killed?

A. 80

Correct B. 120

C. 160

D. 200

Correct Answer: B

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Question 17 View Details

A 2.5-liter sample of a gas at 3.0 atm and 25°C is heated to 50°C at cons\tant volume. What is the final pressure of the gas?

A. 4.0 atm

B. 4.5 atm

Correct C. 5.0 atm

D. 5.5 atm

Correct Answer: C

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Question 18 View Details

A 0.5-molar solution of HCl is mixed with a 0.5-molar solution of NaOH. What is the resulting pH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 19 View Details

A 10-kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 20 View Details

A 0.5-molar solution of HCl is mixed with a 0.5-molar solution of NaOH. What is the resulting pH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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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'?

Correct A. 0.16

B. 0.36

C. 0.64

D. 0.84

Correct Answer: A

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Question 22 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. 1/4

Correct B. 1/2

C. 3/4

D. 1

Correct Answer: B

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Question 23 View Details

In a human cell, the process of mitosis involves the separation of chromosomes into two daughter cells. Which of the following stages of mitosis is characterized by the formation of a spindle apparatus?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 24 View Details

A solution of glu\cose is placed in a beaker and allowed to diffuse into a solution of water. What is the direction of the net movement of glu\cose molecules?

Correct A. From the glu\cose solution to the water solution

B. From the water solution to the glu\cose solution

C. There is no net movement

D. The movement is random

Correct Answer: A

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Question 25 View Details

A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'tt'?

A. 1/4

Correct B. 1/2

C. 3/4

D. 1

Correct Answer: B

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