Practice Post UTME UNILORIN biology 2020 Past Questions

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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 2

A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.

A. Mitochondria

Correct B. Ribosomes

C. Endoplasmic Reticulum

D. Lysosomes

Correct Answer: B

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Question 3

A 5.0 g sample of a subs\tance is dissolved in 50.0 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?

Correct A. 10.0 g/mol

B. 20.0 g/mol

C. 30.0 g/mol

D. 40.0 g/mol

Correct Answer: A

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Question 4

A diagram of a simple harmonic motion is shown below. Identify the type of motion.

Correct A. Simple Harmonic Motion

B. Damped Harmonic Motion

C. Forced Harmonic Motion

D. Oscillatory Motion

Correct Answer: A

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Question 5

A 2.0 L sample of a gas is collected at 25°C and 1.0 atm. If the gas is compressed to 2.0 atm, what is the new volume of the gas?

A. 1.0 L

Correct B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: B

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Question 6

In the context of evolutionary theory, what is the primary mechanism by which genetic drift acts to reduce genetic variation within a population?

A. Gene flow

B. Mutation

Correct C. Genetic drift

D. Natural selection

Correct Answer: C

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Question 7

A diagram of a neuron is shown below. Which part of the neuron is responsible for transmitting signals to other neurons?

A. D\endrite

Correct B. Axon

C. Cell body

D. Myelin sheath

Correct Answer: B

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Question 8

In a population of 100 individuals, the frequency of the dominant allele is 0.6. What is the expected frequency of the recessive allele?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 9

A diagram of a mitotic cell division is shown below. Which stage of the cell cycle is represented by the diagram?

A. Prophase

Correct B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: B

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Question 10

In a population of 100 individuals, the frequency of the dominant allele is 0.8. What is the expected frequency of the recessive allele?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 11

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. 0.64

B. 0.36

C. 0.16

D. 0.84

Correct Answer: A

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Question 12

A diagram of the human respiratory system is shown below. Which part of the diagram is responsible for the exchange of oxygen and carbon dioxide?

A. The trachea

B. The diaphragm

Correct C. The lungs

D. The bronchi

Correct Answer: C

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Question 13

A population of bacteria is growing exponentially. If the initial population size is 100 and the population doubles every 2 hours, what is the population size after 6 hours?

Correct A. 1600

B. 1200

C. 800

D. 600

Correct Answer: A

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Question 14

A diagram of the human eye is shown below. Which part of the diagram is responsible for adjusting the size of the pupil?

A. The cornea

Correct B. The iris

C. The retina

D. The lens

Correct Answer: B

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Question 15

A diagram of the human skeletal system is shown below. Which part of the diagram is responsible for protecting the heart and lungs?

Correct A. The ribcage

B. The sternum

C. The spine

D. The pelvis

Correct Answer: A

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Question 16

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. 0.48

B. 0.36

C. 0.64

D. 0.52

Correct Answer: A

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Question 17

A 2-year-old child is diagnosed with a rare genetic disorder characterized by the inability to synthesize the amino acid phenylalanine. Which of the following enzymes is deficient in this disorder?

Correct A. Phenylalanine hydroxylase

B. Tyro\sine aminotransferase

C. Dihydropteridine reductase

D. GTP cyclohydrolase

Correct Answer: A

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Question 18

A diagram of the human brain is shown below. Which part of the brain is responsible for regulating body temperature?

Correct A. Hypothalamus

B. Cerebellum

C. Pons

D. Medulla oblongata

Correct Answer: A

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Question 19

A 3-year-old child is diagnosed with a rare genetic disorder characterized by the inability to synthesize the amino acid tyro\sine. Which of the following enzymes is deficient in this disorder?

A. Phenylalanine hydroxylase

Correct B. Tyro\sine aminotransferase

C. Dihydropteridine reductase

D. GTP cyclohydrolase

Correct Answer: B

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Question 20

A diagram of the human eye is shown below. Which part of the eye is responsible for regulating the amount of light entering the eye?

A. Cornea

Correct B. Iris

C. Lens

D. Retina

Correct Answer: B

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Question 21

In the context of eco\logy, what is the primary function of a keystone species in a given biome?

A. To occupy a unique eco\logical niche

B. To regulate the population of other species

C. To facilitate the process of nutrient cycling

Correct D. To maintain the structural complexity of the e\cosystem

Correct Answer: D

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Question 22

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 23

In the context of respiration, what is the primary function of the mitochondria?

Correct A. To synthesize ATP from glu\cose

B. To break down glu\cose to produce energy

C. To regulate the pH of the blood

D. To transport oxygen to the cells

Correct Answer: A

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Question 24

A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients from the food?

A. Mouth

B. Esophagus

C. Stomach

Correct D. Small intestine

Correct Answer: D

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Question 25

In the context of eco\logy, what is the primary function of a pioneer species in a given biome?

A. To occupy a unique eco\logical niche

B. To regulate the population of other species

Correct C. To facilitate the process of nutrient cycling

D. To maintain the structural complexity of the e\cosystem

Correct Answer: C

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