Practice Post UTME OAU biology 2017 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 homozygous dominant genotype 'AA'?

A. 0.36

Correct B. 0.64

C. 0.72

D. 0.88

Correct Answer: B

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Question 2

A diagram of a plant cell is shown below. Identify the part labeled 'X'.

A. A

B. B

C. C

Correct D. D

Correct Answer: D

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Question 3

A certain species of bacteria has a generation time of 2 hours. If the initial population is 1000 cells, how many cells will be present after 5 generations?

A. 1000

Correct B. 160000

C. 320000

D. 640000

Correct Answer: B

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Question 4

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

A. A

B. B

C. C

Correct D. D

Correct Answer: D

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Question 5

A certain species of plant has a photosynthetic rate of 10 mg CO2/hour. If the plant is exposed to light for 8 hours, how much CO2 will be fixed?

A. 40

B. 60

Correct C. 80

D. 100

Correct Answer: C

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Question 6

In a population of E. coli, the average generation time is 20 minutes. If the population is doubling every 30 minutes, what is the growth rate cons\tant (r) in units of 1/min?

A. 0.023

Correct B. 0.025

C. 0.027

D. 0.029

Correct Answer: B

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Question 7

A 2.5-g sample of a compound containing only carbon, hydrogen, and oxygen is analyzed by combustion. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.45 g. What is the empirical formula of the compound?

Correct A. C2H4O

B. C3H6O2

C. C4H8O3

D. C5H10O4

Correct Answer: A

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Question 8

A nerve impulse travels down a neuron at a speed of 120 m/s. If the impulse is 1.5 cm long, how long does it take to travel from the d\endrite to the axon hillock?

Correct A. 0.0125 s

B. 0.025 s

C. 0.05 s

D. 0.1 s

Correct Answer: A

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Question 9

A 1.0-L sample of a solution containing 0.25 M NaCl is diluted to 5.0 L. What is the new concentration of NaCl?

A. 0.005 M

Correct B. 0.01 M

C. 0.02 M

D. 0.05 M

Correct Answer: B

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Question 10

A 50-g sample of a mixture containing 25% NaCl and 75% H2O is heated to produce water vapor. If 20 g of water vapor is collected, what is the mass of NaCl in the original sample?

A. 10 g

Correct B. 15 g

C. 20 g

D. 25 g

Correct Answer: B

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Question 11

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the

Correct A. Spindle fibers

B. Centrioles

C. Telophase

D. Prophase

Correct Answer: A

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Question 12

The process of photosynthesis in plants involves the conversion of light energy into chemical energy, which is stored in the form of

A. ATP and NADPH

Correct B. Glu\cose and Oxygen

C. Starch and Water

D. Proteins and Fats

Correct Answer: B

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Question 13

The human body is composed of various systems, including the circulatory, respiratory, and nervous systems. Which of the following is a function of the

A. Circulatory System

B. Respiratory System

Correct C. Nervous System

D. Digestive System

Correct Answer: C

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Question 14

The process of cell division is essential for the growth and development of living organisms. Which of the following stages of cell division is characterized by the

A. Interphase

Correct B. Prophase

C. Metaphase

D. Telophase

Correct Answer: B

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Question 15

The human body is home to a vast array of microorganisms, including bacteria, viruses, and fungi. Which of the following is a function of the

Correct A. Immune System

B. Nervous System

C. Circulatory System

D. Digestive System

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. 0.72

D. 0.84

Correct Answer: B

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Question 17

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. 0.9

Correct Answer: A

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Question 18

A diagram of a human kidney is shown below. Identify the structure labeled 'A'.

Correct A. renal_pelvis

B. renal_artery

C. renal_vein

D. renal_cortex

Correct Answer: A

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Question 19

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

A. pulmonary_vein

Correct B. aorta

C. pulmonary_artery

D. coronary_artery

Correct Answer: B

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Question 20

A diagram of a human brain is shown below. Identify the structure labeled 'C'.

A. cerebral_cortex

B. cerebellum

Correct C. cerebrum

D. brainstem

Correct Answer: C

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Question 21

The process of mitosis in eukaryotic cells is divided into several stages. Which of the following stages is characterized by the condensation of chromatin and the formation of the nuclear envelope?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 22

In the context of evolutionary bio\logy, what is the term for the process by which a new species emerges from an existing one?

Correct A. Speciation

B. Adaptation

C. Mutation

D. Genetic Drift

Correct Answer: A

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Question 23

The diagram below shows the structure of a plant cell. Identify the part labeled 'A'.

Correct A. Cell Wall

B. Cytoplasm

C. Nucleus

D. Vacuole

Correct Answer: A

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Question 24

The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following equations represents the overall reaction?

Correct A. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2 \)

B. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \)

C. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 \)

D. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 \)

Correct Answer: A

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Question 25

The diagram below shows a simple circuit with a battery, a resistor, and a light bulb. Identify the part labeled 'B'.

A. Battery

Correct B. Resistor

C. Light Bulb

D. Wires

Correct Answer: B

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