Practice Post UTME BSU biology 2020 Past Questions

Question 1

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

A. Random mating

Correct B. No mutation

C. No gene flow

D. No natural selection

Correct Answer: B

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Question 2

In the process of osmoregulation, the kidneys play a crucial role in maintaining the balance of electrolytes and water in the body. Which of the following is a mechanism by which the kidneys help to regulate the concentration of ions in the blood?

Correct A. Reabsorption of ions

B. Secretion of ions

C. Excretion of ions

D. Regulation of blood pressure

Correct Answer: A

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Question 3

The process of respiration involves the breakdown of glu\cose to produce energy for the body. Which of the following is a byproduct of the citric acid cycle?

A. ATP

Correct B. NADH

C. FADH2

D. Pyruvate

Correct Answer: B

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Question 4

The growth and development of an organism are influenced by a variety of factors, including genetics, environment, and nutrition. Which of the following is a type of growth that occurs in response to an increase in the availability of nutrients?

A. Hormonal growth

Correct B. Nutritional growth

C. Genetic growth

D. Environmental growth

Correct Answer: B

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Question 5

The e\cosystem of a tropical rainforest is characterized by a high level of biodiversity and a complex web of relationships between organisms. Which of the following is a type of symbiotic relationship that occurs between two species in a tropical rainforest?

Correct A. Mutualism

B. Commensalism

C. Parasitism

D. Predation

Correct Answer: A

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Question 6

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. 0.84

Correct Answer: A

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Question 7

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.15 m from its equilibrium position and released from rest, what is the maximum speed of the block?

A. 0.45 m/s

Correct B. 0.55 m/s

C. 0.65 m/s

D. 0.75 m/s

Correct Answer: B

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Question 8

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

A. 0

Correct B. 1

C. 2

D. 3

Correct Answer: B

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Question 9

A plant grows in a nutrient-poor soil. Which of the following is a likely adaptation of the plant?

A. Deep roots to access water

Correct B. Small leaves to reduce water loss

C. Thick cuticle to prevent water loss

D. Large leaves to increase photosynthesis

Correct Answer: B

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Question 10

A 1.5 kg block is moving at a speed of 4 m/s when it collides with a stationary 2.0 kg block. If the collision is perfectly inelastic, what is the speed of the combined blocks after the collision?

A. 2.0 m/s

Correct B. 2.5 m/s

C. 3.0 m/s

D. 3.5 m/s

Correct Answer: B

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Question 11

A patient with a rare genetic disorder has a mutation in the gene encoding the enzyme responsible for converting phenylalanine to tyro\sine. Which of the following is a likely consequence of this mutation?

Correct A. Increased levels of phenylalanine in the blood

B. Decreased levels of tyro\sine in the blood

C. No effect on phenylalanine or tyro\sine levels

D. Increased risk of developing Parkinson's disease

Correct Answer: A

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Question 12

A neuron is stimulated by a sensory input and undergoes a series of electrical and chemical changes. Which of the following is a key feature of the action potential?

A. The action potential is a graded response

Correct B. The action potential is an all-or-nothing response

C. The action potential is a long-lasting response

D. The action potential is a response that can be reversed

Correct Answer: B

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Question 13

A cell is in the process of dividing and has reached the anaphase stage. Which of the following is a key feature of this stage?

Correct A. The sister chromatids are moving towards the poles

B. The centromeres are separating

C. The nuclear envelope is reforming

D. The cytoplasm is dividing

Correct Answer: A

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Question 14

A patient has a kidney stone that is cau\sing severe pain. Which of the following is a likely cause of the stone?

Correct A. A diet high in oxalate

B. A diet high in calcium

C. A genetic disorder

D. A bacterial infection

Correct Answer: A

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Question 15

A plant is undergoing a process of growth and development. Which of the following is a key feature of this process?

Correct A. The plant is producing new cells

B. The plant is producing new tissues

C. The plant is producing new organs

D. The plant is producing new systems

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?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.84

Correct Answer: A

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Question 17

A cell in interphase has a DNA content of 6.0 pg. If the cell enters mitosis and undergoes two successive cell divisions, what will be the DNA content of the daughter cells?

A. 3.0 pg

B. 6.0 pg

Correct C. 12.0 pg

D. 24.0 pg

Correct Answer: C

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Question 18

A 5-year-old child is diagnosed with a rare genetic disorder characterized by an 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. Histidine decarboxylase

D. Tryptophan synthase

Correct Answer: A

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Question 19

A patient is diagnosed with a type of cancer that is characterized by the uncontrolled growth of epithelial cells. Which of the following types of cancer is most likely to be diagnosed in this patient?

Correct A. Carcinoma

B. Sarcoma

C. Leukemia

D. Lymphoma

Correct Answer: A

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Question 20

A scientist is studying the effects of a new pesticide on a population of insects. The pesticide is found to have a 90% mortality rate on the insects. What is the expected ratio of dead insects to live insects after one application of the pesticide?

A. 1:10

Correct B. 1:9

C. 1:8

D. 1:7

Correct Answer: B

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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 dominant genotype 'RR'?

A. 0.16

B. 0.32

Correct C. 0.64

D. 0.8

Correct Answer: C

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Question 22

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of the gas is removed, what is the new pressure of the gas?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 23

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'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1.0

Correct Answer: A

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Question 24

A 5.0 L flask contains 2.0 mol of an ideal gas at 37°C. If the gas is compressed to 2.0 L, what is the new pressure of the gas?

A. 2.0 atm

B. 3.0 atm

Correct C. 4.0 atm

D. 5.0 atm

Correct Answer: C

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Question 25

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. 0.25

Correct B. 0.5

C. 0.75

D. 1.0

Correct Answer: B

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