Practice Post UTME RSU biology 2025 Past Questions

Question 1

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

Correct B. 0.64

C. 0.8

D. 0.96

Correct Answer: B

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Question 2

A 2.0 L flask contains 1.0 mol of an ideal gas at 300 K. If 1.0 mol of an ideal gas is added to the flask at the same temperature, what is the new pressure of the gas mixture?

A. 2.0 atm

Correct B. 4.0 atm

C. 6.0 atm

D. 8.0 atm

Correct Answer: B

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Question 3

A 10.0 g sample of a compound is analyzed by combustion analysis and found to contain 6.0 g of carbon and 4.0 g of hydrogen. What is the empirical formula of the compound?

A. CH

B. C2H2

C. C2H4

Correct D. C2H6

Correct Answer: D

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Question 4

A 5.0 L flask contains 2.0 mol of an ideal gas at 400 K. If the gas is compressed to 1.0 L, what is the new temperature of the gas?

A. 200 K

B. 400 K

Correct C. 600 K

D. 800 K

Correct Answer: C

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Question 5

A 2.0 L flask contains 1.0 mol of an ideal gas at 300 K. If the gas is expanded to 5.0 L, what is the new pressure of the gas?

A. 0.5 atm

B. 1.0 atm

Correct C. 2.0 atm

D. 3.0 atm

Correct Answer: C

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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 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 8

In a process of osmoregulation, a cell maintains a stable concentration of solutes by regulating the amount of water it takes in or releases. What is the primary mechanism by which this process occurs?

A. Active transport

B. Passive transport

Correct C. Osmosis

D. Diffusion

Correct Answer: C

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Question 9

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

A. Trachea

B. Bronchi

Correct C. Alveoli

D. Diaphragm

Correct Answer: C

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Question 10

In a population of E. coli, the frequency of the dominant allele 'B' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'bb'?

Correct A. 0.04

B. 0.16

C. 0.24

D. 0.36

Correct Answer: A

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Question 11

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 recessive genotype 'rr'?

Correct A. 0.04

B. 0.02

C. 0.08

D. 0.12

Correct Answer: A

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Question 12

A researcher is studying the effect of temperature on the rate of photosynthesis in plants. Which of the following is a likely consequence of increa\sing the temperature?

A. Increased stomatal density

B. Decreased chlorophyll content

Correct C. Increased rate of photosynthesis

D. Decreased rate of transpiration

Correct Answer: C

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Question 13

A patient has been diagnosed with a genetic disorder caused by a point mutation in the DNA sequence. Which of the following is a possible consequence of this mutation?

A. Frameshift mutation

B. Splice site mutation

C. Nonsense mutation

Correct D. Missense mutation

Correct Answer: D

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Question 14

A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following is a likely consequence of increa\sing the pH?

Correct A. Increased enzyme activity

B. Decreased enzyme activity

C. No change in enzyme activity

D. Increased substrate concentration

Correct Answer: A

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Question 15

A cell is in the G2 phase of the cell cycle. Which of the following is a characteristic of this phase?

A. DNA replication occurs

B. Mitosis occurs

Correct C. Growth and preparation for mitosis occur

D. Interphase occurs

Correct Answer: C

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Question 16

In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?

Correct A. To conserve water by reabsorbing water from the filtrate

B. To excrete excess salt by producing a hypertonic urine

C. To regulate electrolyte balance by adjusting the amount of ions in the urine

D. To maintain acid-base balance by adjusting the pH of the urine

Correct Answer: A

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Question 17

A cell is placed in a hypertonic solution. What will happen to the cell?

Correct A. The cell will swell and eventually burst

B. The cell will shrink and lose water

C. The cell will remain unchanged

D. The cell will undergo mitosis

Correct Answer: A

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Question 18

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

A. To synthesize proteins

Correct B. To store genetic information

C. To regulate cell growth

D. To transport materials across the cell membrane

Correct Answer: B

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Question 19

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

Correct A. To transmit signals to other nerve cells

B. To synthesize neurotransmitters

C. To regulate muscle contraction

D. To store genetic information

Correct Answer: A

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Question 20

A diagram of a hormonal system is shown below. What is the function of the structure labeled 'C'?

Correct A. To bind to hormone molecules

B. To synthesize hormones

C. To regulate gene expression

D. To transport hormones across cell membranes

Correct Answer: A

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Question 21

In the context of eco\logy, what is the primary difference between a biome and a habitat?

Correct A. A biome is a large, naturally occurring community of plants and animals that occupy a specific habitat.

B. A habitat is a specific type of biome that is characterized by a unique set of plants and animals.

C. A biome is a smaller, more localized community of plants and animals that occupy a specific habitat.

D. A habitat is a larger, more complex community of plants and animals that occupy a specific biome.

Correct Answer: A

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Question 22

What is the process by which plants convert light energy from the sun into chemical energy in the form of glu\cose?

Correct A. Photosynthesis

B. Respiration

C. Transpiration

D. Evaporation

Correct Answer: A

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Question 23

In genetics, what is the term for the process by which an organism's genetic information is passed from one generation to the next?

A. Mutation

B. Genetic drift

C. Natural selection

Correct D. Heritability

Correct Answer: D

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Question 24

What is the primary function of the nervous system in an organism?

A. To regulate body temperature

B. To control movement

Correct C. To transmit and process information

D. To produce hormones

Correct Answer: C

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Question 25

In the context of respiration, what is the term for the process by which oxygen is transported from the lungs to the body's cells?

A. Diffusion

B. Osmosis

C. Active transport

Correct D. Oxygen delivery

Correct Answer: D

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