Practice post utme coal city university biology 2025 Past Questions

Question 1

In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?

Correct A. Fixation of CO2

B. Reduction of NADP+

C. Regeneration of RuBP

D. Oxidation of NADPH

Correct Answer: A

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Question 2

A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is selectively permeable, what will be the net movement of glu\cose across the membrane?

A. Into the cell

Correct B. Out of the cell

C. No net movement

D. Dep\ends on the concentration gradient

Correct Answer: B

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Question 3

A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?

Correct A. Transport of water and minerals

B. Transport of sugars and amino acids

C. Support and storage

D. Protection from pathogens

Correct Answer: A

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Question 4

A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 5

A diagram of the human eye is shown below. What is the primary function of the lens?

A. B\ending of light rays

B. Absorption of light

Correct C. Re\fraction of light

D. Transmission of light

Correct Answer: C

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Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?

Correct A. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 7

A plant cell has a vacuole with a volume of 100 μm^3. If the concentration of solutes in the vacuole is 0.5 M, what is the total number of solute particles in the vacuole?

A. 5.0 x 10^8

B. 1.0 x 10^9

Correct C. 2.5 x 10^9

D. 5.0 x 10^9

Correct Answer: C

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Question 8

A 2.0 L sample of a gas at 27°C is collected over water at 25°C. The vapor pressure of water at 25°C is 3.0 kPa. If the total pressure of the gas is 4.0 kPa, what is the partial pressure of the gas?

A. 1.0 kPa

Correct B. 2.0 kPa

C. 3.0 kPa

D. 4.0 kPa

Correct Answer: B

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Question 9

A 50 g sample of a subs\tance is dissolved in 100 mL of water. If the concentration of the solution is 0.5 M, what is the molarity of the solution?

A. 0.25 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 10

A 2.0 L sample of a gas at 27°C is collected over water at 25°C. The vapor pressure of water at 25°C is 3.0 kPa. If the total pressure of the gas is 4.0 kPa, what is the partial pressure of the gas?

A. 1.0 kPa

Correct B. 2.0 kPa

C. 3.0 kPa

D. 4.0 kPa

Correct Answer: B

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Question 11

In the context of evolutionary bio\logy, what is the primary mechanism driving the adaptation of populations to changing environments?

Correct A. Natural Selection

B. Genetic Drift

C. Gene Flow

D. Mutation

Correct Answer: A

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Question 12

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

Correct A. To focus light on the retina

B. To detect movement

C. To regulate pupil size

D. To produce tears

Correct Answer: A

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Question 13

In a population of 1000 individuals, 20% have the genotype 'AA', 60% have the genotype 'Aa', and 20% have the genotype 'aa'. What is the frequency of the 'a' allele?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 14

A diagram of the human circulatory system is shown below. What is the function of the structure labeled 'B'?

A. To pump blood to the lungs

Correct B. To carry oxygenated blood to the body

C. To regulate blood pressure

D. To produce blood cells

Correct Answer: B

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Question 15

In a solution of 0.1 M glu\cose, what is the concentration of glu\cose in a 5 mL sample?

A. 0.005 M

Correct B. 0.01 M

C. 0.05 M

D. 0.1 M

Correct Answer: B

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Question 16

In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic, 10% are resis\tant, and the remaining 10% are intermediate. If 100 bacteria are exposed to the antibiotic, how many will be killed?

A. 80

B. 90

Correct C. 100

D. 120

Correct Answer: C

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Question 17

A 2.5 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. If 1.8 g of CO2 and 0.5 g of H2O are produced, what is the empirical formula of the compound?

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 18

A 10 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 19

A 50 g sample of a mixture of NaCl and KCl is analyzed by flame photometry. If the concentration of Na+ is 0.05 M and the concentration of K+ is 0.03 M, what is the mass of NaCl in the sample?

A. 10 g

B. 20 g

Correct C. 30 g

D. 40 g

Correct Answer: C

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Question 20

A 100 mL sample of a 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 21

In a eukaryotic cell, the process of mitosis involves the replication of DNA and the subsequent division of the cell into two daughter cells. Which of the following stages of mitosis is characterized by the condensation of chromatin into visible chromosomes?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 22

The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of the light-dep\endent reactions in photosynthesis?

A. ATP

B. NADPH

Correct C. O2

D. H2O

Correct Answer: C

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Question 23

The classification of living organisms into kingdoms is based on their cell structure and evolutionary relationships. Which of the following kingdoms is characterized by the presence of a true nucleus and complex cell structures?

A. Monera

B. Protista

C. Fungi

Correct D. Animalia

Correct Answer: D

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Question 24

The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for the breakdown of proteins into amino acids?

A. Amylase

B. Lipase

Correct C. Tryp\sin

D. Lactase

Correct Answer: C

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Question 25

The e\cosystem of a coral reef is characterized by a diverse array of species that interact with each other in complex ways. Which of the following is an example of a symbiotic relationship in a coral reef e\cosystem?

A. Predation

B. Competition

Correct C. Mutualism

D. Commensalism

Correct Answer: C

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