POST UTME WELLSPRING UNIVERSITY 2024 Biology | Objective

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Question 1
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. What is the name of the structure that forms during this process, which eventually gives rise to the nuclear envelope of the daughter cells?
Correct A. Nuclear matrix
B. Nuclear envelope
C. Mitotic spindle
D. Centriole

Correct Answer: A

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Question 2
A patient is diagnosed with a bacterial infection caused by a Gram-positive bacterium. Which of the following antibiotics would be most effective in treating this infection?
Correct A. Penicillin
B. Erythromycin
C. Tetracycline
D. Ciprofloxacin

Correct Answer: A

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Question 3
In a plant cell, the process of photosynthesis occurs in the chloroplasts. What is the name of the pigment responsible for absorbing light energy during this process?
Correct A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Phycobiliproteins

Correct Answer: A

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Question 4
A patient is experiencing difficulty breathing due to a blockage in the airway. Which of the following medical procedures would be most effective in relieving this blockage?
A. Tracheotomy
Correct B. Endotracheal intubation
C. Cricothyrotomy
D. Thoracotomy

Correct Answer: B

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Question 5
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. What is the name of the structure that forms during this process, which eventually gives rise to the nuclear envelope of the daughter cells?
Correct A. Nuclear matrix
B. Nuclear envelope
C. Mitotic spindle
D. Centriole

Correct Answer: A

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Question 6
In the xylem transport system, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from roots to leaves
B. Transport of sugars from leaves to roots
C. Support and structure of the plant
D. Production of hormones

Correct Answer: A

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Question 7
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. Heredity

Correct Answer: D

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Question 8
In the human eye, what is the primary function of the retina?
A. To focus light on the lens
Correct B. To convert light into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears

Correct Answer: B

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Question 9
What is the term for the process by which microorganisms cause disease in humans?
Correct A. Infection
B. Toxemia
C. Allergies
D. Autoimmune disorders

Correct Answer: A

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Question 10
In the process of sexual reproduction, what is the term for the fusion of male and female gametes?
A. Meiosis
B. Mitosis
C. Fertilization
Correct D. Syngamy

Correct Answer: D

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Question 11
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the primary producers. Which of the following is a characteristic of the primary consumers in this e\cosystem?
A. They have a high metabolic rate to digest cellulose in plant cell walls.
B. They have a low metabolic rate to conserve energy for reproduction.
C. They have a large body size to intimidate predators.
Correct D. They have a specialized digestive system to break down plant cell walls.

Correct Answer: D

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Question 12
A plant cell has a high concentration of starch grains in its chloroplasts. Which of the following is a likely consequence of this?
A. The plant cell will undergo rapid cell division.
B. The plant cell will undergo rapid cell growth.
Correct C. The plant cell will produce more ATP through photosynthesis.
D. The plant cell will undergo programmed cell death.

Correct Answer: C

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Question 13
A population of rabbits is growing exponentially. If the initial population size is 100 and the growth rate is 20% per year, what is the population size after 5 years?
A. 1000
B. 2000
C. 5000
Correct D. 10000

Correct Answer: D

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Question 14
A genetic cross between two pea plants results in a 3:1 ratio of tall plants to short plants. What is the genotype of the short plants?
A. Tt
Correct B. tt
C. TT
D. Tt or tt

Correct Answer: B

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Question 15
A species of bird has a reproductive strategy of semelparity. Which of the following is a characteristic of this species?
A. They invest energy in producing large offspring.
Correct B. They invest energy in producing many offspring.
C. They invest energy in producing offspring with high survival rates.
D. They invest energy in producing offspring with high reproductive success.

Correct Answer: B

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Question 16
The enzyme responsible for the breakdown of starch into maltose is:
Correct A. Amylase
B. Lactase
C. Sucrase
D. Maltase

Correct Answer: A

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Question 17
The process by which plants convert light energy into chemical energy is known as:
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Osmosis

Correct Answer: B

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Question 18
The hormone responsible for the regulation of blood sugar levels is:
Correct A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroxine

Correct Answer: A

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Question 19
The process by which the body removes waste products is known as:
Correct A. Excretion
B. Osmoregulation
C. Respiration
D. Photosynthesis

Correct Answer: A

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Question 20
The type of muscle fiber that is responsible for slow, sustained contractions is:
A. Skeletal muscle
B. Cardiac muscle
C. Smooth muscle
Correct D. Red muscle

Correct Answer: D

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Question 21
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following adaptations would be most beneficial for a primary consumer in this environment?
A. Large body size to intimidate predators
Correct B. Specialized digestive system to break down cellulose in plant cell walls
C. Camouflage to avoid detection by predators
D. Strong legs for rapid escape from predators

Correct Answer: B

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Question 22
A plant with a xylem sap flow rate of 0.5 L/h and a transpiration rate of 0.2 L/h is placed in a controlled environment with a temperature of 25°C and a relative humidity of 60%. What is the minimum rate of water uptake required to maintain a positive water potential?
Correct A. 0.3 L/h
B. 0.4 L/h
C. 0.5 L/h
D. 0.6 L/h

Correct Answer: A

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Question 23
A neuron has a resting membrane potential of -70 mV and a threshold potential of -55 mV. If the neuron is stimulated with a depolarizing current of 0.5 mA, what is the minimum duration of the stimulus required to reach the threshold potential?
A. 0.1 ms
Correct B. 0.2 ms
C. 0.3 ms
D. 0.4 ms

Correct Answer: B

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Question 24
A population of rabbits is growing exponentially with a growth rate of 0.2 per year. If the initial population size is 100 rabbits, what is the population size after 5 years?
A. 1000
Correct B. 2000
C. 3000
D. 4000

Correct Answer: B

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Question 25
A plant has a root system with a total surface area of 100 cm^2 and a soil water potential of -10 kPa. If the plant is subjected to a drought, what is the minimum rate of water uptake required to maintain a positive water potential?
Correct A. 0.01 cm^3/h
B. 0.02 cm^3/h
C. 0.03 cm^3/h
D. 0.04 cm^3/h

Correct Answer: A

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