POST UTME WELLSPRING UNIVERSITY 2018 Biology | Objective

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Question 1
In a population of 1000 individuals, 80% are homozygous dominant (BB), 15% are heterozygous (Bb), and 5% are homozygous recessive (bb). What is the frequency of the recessive allele (b) in this population?
Correct A. 0.05
B. 0.15
C. 0.20
D. 0.25

Correct Answer: A

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Question 2
A diagram of the human respiratory system is shown below. Identify the structure labeled 'A' in the diagram.
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 3
A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 0.01 cm/s, what is the rate of diffusion of H+ ions across the membrane?
A. 0.05 cm/s
Correct B. 0.01 cm/s
C. 0.005 cm/s
D. 0.0005 cm/s

Correct Answer: B

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Question 4
A diagram of a cell division process is shown below. Identify the stage labeled 'A' in the diagram.
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 5
A diagram of a food chain is shown below. Identify the producer in the food chain.
Correct A. Grass
B. Rabbit
C. Fox
D. Snake

Correct Answer: A

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Question 6
In a diploid cell, what is the total number of chromosomes in the somatic cells?
A. 46
B. 92
C. 23
Correct D. 46

Correct Answer: D

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Question 7
What is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. Cell signaling
Correct C. Energy production
D. Cell division

Correct Answer: C

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Question 8
What is the process by which plants release water vapor into the air?
A. Photosynthesis
B. Respiration
Correct C. Transpiration
D. Osmosis

Correct Answer: C

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Question 9
What is the term for the movement of molecules from an area of high concentration to an area of low concentration?
A. Osmosis
Correct B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: B

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Question 10
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 11
In the process of cellular respiration, what is the primary function of the mitochondria?
A. To synthesize proteins
Correct B. To generate energy for the cell
C. To store genetic information
D. To regulate cell growth

Correct Answer: B

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Question 12
A diagram of the human circulatory system is shown below.
Correct A. The heart pumps blood to the lungs
B. The heart pumps blood to the brain
C. The heart pumps blood to the liver
D. The heart pumps blood to the kidneys

Correct Answer: A

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Question 13
In the context of growth and development, what is the term for the process by which an organism increases in size?
A. Mitosis
B. Meiosis
C. Hormesis
Correct D. Hyperplasia

Correct Answer: D

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Question 14
A diagram of the structure of a prokaryotic cell is shown below.
Correct A. The cell wall is composed of peptidoglycan
B. The plasma membrane is semi-permeable
C. The ribosomes are responsible for protein synthesis
D. The cell wall is composed of polysaccharides

Correct Answer: A

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Question 15
In the context of microorganisms and diseases, what is the term for the process by which a pathogen invades and colonizes a host?
A. Infection
Correct B. Colonization
C. Toxification
D. Transduction

Correct Answer: B

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Question 16
The process of binary fission in bacteria involves the replication of the bacterial chromosome and the division of the cell into two daughter cells. Which of the following is a characteristic of the replicated chromosome during this process?
A. The replicated chromosome is attached to the cell membrane.
B. The replicated chromosome is attached to the cell wall.
C. The replicated chromosome is free-floating within the cytoplasm.
Correct D. The replicated chromosome is attached to the nucleoid.

Correct Answer: D

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Question 17
In asexual reproduction, the offspring are genetically identical to the parent. Which of the following is an example of asexual reproduction?
Correct A. Budding in yeast
B. Binary fission in bacteria
C. Mitosis in animal cells
D. Meiosis in plant cells

Correct Answer: A

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Question 18
The water cycle involves the movement of water between the Earth's oceans, atmosphere, and land. Which of the following is a part of the water cycle?
A. Evaporation
B. Condensation
C. Runoff
Correct D. All of the above

Correct Answer: D

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Question 19
The cell membrane is a semi-permeable membrane that regulates the movement of subs\tances in and out of the cell. Which of the following is a function of the cell membrane?
Correct A. To regulate the movement of subs\tances in and out of the cell
B. To provide structural support to the cell
C. To synthesize proteins
D. To store genetic information

Correct Answer: A

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Question 20
The process of mitosis involves the replication of the cell's DNA and the division of the cell into two daughter cells. Which of the following is a stage of mitosis?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 21
In the process of cellular respiration, what is the primary function of the mitochondria?
A. To synthesize proteins
Correct B. To generate energy for the cell
C. To regulate cell growth
D. To transport molecules across the cell membrane

Correct Answer: B

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Question 22
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 23
In the e\cosystem of a freshwater lake, what is the primary role of phytoplankton?
A. To decompose organic matter
Correct B. To produce oxygen through photosynthesis
C. To consume zooplankton
D. To regulate water temperature

Correct Answer: B

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Question 24
A diagram of the human skeletal system is shown below. Which bone is responsible for protecting the heart?
Correct A. Skull
B. Ribs
C. Spine
D. Sternum

Correct Answer: A

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Question 25
In the process of cellular division, what is the primary function of the mitotic spindle?
A. To synthesize DNA
Correct B. To separate chromosomes
C. To regulate cell growth
D. To transport molecules across the cell membrane

Correct Answer: B

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