Practice Post UTME MOUNTAIN TOP UNIVERSITY biology 2018 Past Questions

Question 1

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

A. To produce ATP through the citric acid cycle

B. To generate NADH and FADH2 through glycolysis

Correct C. To produce ATP through oxidative phosphorylation

D. To generate ATP through substrate-level phosphorylation

Correct Answer: C

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Question 2

A 25-year-old patient presents with symptoms of hypothyroidism. Which of the following hormones is most likely to be deficient?

Correct A. Thyroid-stimulating hormone (TSH)

B. Triiodothyronine (T3)

C. Thyroxine (T4)

D. Adrenaline

Correct Answer: A

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Question 3

In the context of transport systems, what is the primary function of the xylem in plants?

Correct A. To transport water and minerals from the roots to the leaves

B. To transport sugars and amino acids from the leaves to the roots

C. To transport hormones and other signaling molecules throughout the plant

D. To transport waste products from the leaves to the roots

Correct Answer: A

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Question 4

A 30-year-old patient presents with symptoms of chronic kidney disease. Which of the following hormones is most likely to be deficient?

Correct A. Erythropoietin (EPO)

B. Thyroid-stimulating hormone (TSH)

C. Adrenaline

D. Insulin

Correct Answer: A

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Question 5

In the context of microorganisms and diseases, what is the primary function of the immune system in the body?

A. To produce antibodies to fight off pathogens

B. To activate the complement system to lyse pathogens

C. To activate macrophages to engulf and digest pathogens

Correct D. To produce cytokines to recruit immune cells to the site of infection

Correct Answer: D

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Question 6

In a tropical rainforest, the primary consumers are primarily herbivores. What is the most likely reason for this phenomenon?

A. High levels of herbivore predation by carnivores

Correct B. Low levels of herbivore predation by carnivores

C. High levels of plant defense mechanisms

D. Low levels of plant defense mechanisms

Correct Answer: B

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Question 7

A plant with a C4 photosynthetic pathway has a higher water-use efficiency than a plant with a C3 photosynthetic pathway. What is the primary reason for this difference?

A. Higher stomatal density in C4 plants

B. Lower stomatal density in C4 plants

Correct C. Higher CO2 fixation rates in C4 plants

D. Lower CO2 fixation rates in C4 plants

Correct Answer: C

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Question 8

A population of rabbits is growing exponentially. If the initial population size is 100 rabbits and the growth rate is 0.2 per year, what is the population size after 5 years?

A. 1000

B. 2000

Correct C. 5000

D. 10000

Correct Answer: C

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Question 9

A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?

Correct A. Photosynthesis

B. Respiration

C. Transpiration

D. Osmosis

Correct Answer: A

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Question 10

A diagram of a simple e\cosystem is shown below. What is the primary role of the structure labeled 'B'?

A. Producer

Correct B. Consumer

C. Decomposer

D. Nutrient cycler

Correct Answer: B

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Question 11

In a tropical rainforest, the energy flow from producers to primary consumers is typically described by which of the following trophic levels?

Correct A. Producers > Primary Consumers > Secondary Consumers

B. Producers > Primary Consumers > Tertiary Consumers

C. Producers > Primary Consumers > Decomposers

D. Producers > Primary Consumers > Omnivores

Correct Answer: A

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Question 12

In a typical xylem vessel, what is the primary function of the lignin component?

Correct A. To provide structural support to the vessel

B. To facilitate the transport of water and minerals

C. To regulate the rate of transpiration

D. To prevent water loss through the cuticle

Correct Answer: A

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Question 13

In a population of rabbits, what is the term for the increase in population size due to the birth of new individuals?

A. Intrinsic growth rate

B. Extrinsic growth rate

Correct C. Birth rate

D. Death rate

Correct Answer: C

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Question 14

In a typical human cell, what is the primary function of the Golgi apparatus?

A. To synthesize proteins

Correct B. To transport materials within the cell

C. To regulate the cell cycle

D. To synthesize lipids

Correct Answer: B

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Question 15

In a typical e\cosystem, what is the term for the process by which dead organisms are broken down and recycled?

Correct A. Decomposition

B. Nutrient cycling

C. Primary production

D. Secondary production

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'?

A. 0.36

Correct B. 0.64

C. 0.48

D. 0.52

Correct Answer: B

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Question 17

A diagram of the human eye is shown below. Identify the part labeled 'A'.

Correct A. Cornea

B. Iris

C. Retina

D. Lens

Correct Answer: A

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Question 18

A population of bacteria is growing exponentially according to the equation \( N(t) = N_0 e^{kt} \). If the initial population is 1000 and the population doubles every 2 hours, what is the value of k?

A. 0.1733

Correct B. 0.3466

C. 0.6931

D. 1.3863

Correct Answer: B

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Question 19

A diagram of the human heart is shown below. Identify the part labeled 'B'.

A. Atrium

Correct B. Ventricle

C. Septum

D. Valve

Correct Answer: B

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Question 20

A population of rabbits is growing according to the equation \( P(t) = P_0 \left\( 1 + \frac{r}{100}\right \)^t \). If the initial population is 100 and the population grows by 10% every year, what is the value of r?

A. 5

Correct B. 10

C. 15

D. 20

Correct Answer: B

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Question 21

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. 0.8

D. 0.16

Correct Answer: B

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Question 22

A 2.5 cm long piece of wire is used to make a circle. What is the radius of the circle?

Correct A. 0.4

B. 0.2

C. 0.1

D. 0.05

Correct Answer: A

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Question 23

A solution of glu\cose is 10% by mass. If 50 g of the solution is diluted to 100 g, what is the new concentration of glu\cose?

Correct A. 5%

B. 10%

C. 15%

D. 20%

Correct Answer: A

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Question 24

A plant grows from a seed in a controlled environment. The plant's height is measured at regular intervals. Which of the following best describes the relationship between the plant's height and time?

A. Exponential growth

Correct B. Linear growth

C. Logarithmic growth

D. No growth

Correct Answer: B

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Question 25

A 10% solution of sodium chloride is prepared by dissolving 10 g of sodium chloride in 90 g of water. What is the concentration of the solution in terms of the number of moles of sodium chloride per liter of solution?

Correct A. 0.1 M

B. 0.5 M

C. 1 M

D. 5 M

Correct Answer: A

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