POST UTME ELIZADE UNIVERSITY 2020 Biology | Objective

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Question 1 View Details
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. What is the name of the stage in which the nuclear envelope breaks down?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 2 View Details
A population of bacteria is growing exponentially. If the initial population is 1000 and the population doubles every 2 hours, what will be the population after 6 hours?
A. 1000
B. 2000
C. 4000
Correct D. 8000

Correct Answer: D

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Question 3 View Details
The diagram below shows a plant cell. What is the function of the structure labeled 'A'?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 4 View Details
A species of bird has a beak that is adapted for cracking open nuts. What is the term for this type of adaptation?
A. Specialization
B. Generalization
Correct C. Adaptation
D. Mutualism

Correct Answer: C

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Question 5 View Details
The diagram below shows a cross-section of a leaf. What is the function of the structure labeled 'B'?
A. Photosynthesis
Correct B. Transpiration
C. Respiration
D. Osmosis

Correct Answer: B

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Question 6 View Details
In the process of cellular respiration, what is the net result of the citric acid cycle?
A. Production of 1 ATP and 1 NADH
Correct B. Production of 2 ATP and 1 FADH2
C. Production of 3 ATP and 1 NADH
D. Production of 1 ATP and 1 FADH2

Correct Answer: B

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Question 7 View Details
A plant cell is placed in a solution with a high concentration of sucrose. 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 grow and divide

Correct Answer: A

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Question 8 View Details
What is the primary function of the xylem in a plant?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and amino acids from the leaves to the roots
C. Support and structure for the plant
D. Storage of food and water

Correct Answer: A

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Question 9 View Details
A cell is in the G2 phase of the cell cycle. What is the next phase?
A. G1 phase
B. S phase
C. G2 phase
Correct D. M phase

Correct Answer: D

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Question 10 View Details
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. What is the expected rate of transpiration?
Correct A. High
B. Low
C. Medium
D. Variable

Correct Answer: A

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Question 11 View Details
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected genotype and phenotype ratio in the offspring of a cross between two heterozygous parents (Aa)?
Correct A. 0.36 AA : 0.48 Aa : 0.16 aa
B. 0.48 AA : 0.36 Aa : 0.16 aa
C. 0.16 AA : 0.48 Aa : 0.36 aa
D. 0.48 AA : 0.16 Aa : 0.36 aa

Correct Answer: A

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Question 12 View Details
A 2.5 L solution of 0.1 M NaCl is diluted to 5 L. What is the concentration of NaCl in the final solution?
Correct A. 0.02 M
B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: A

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Question 13 View Details
A 50 g sample of a subs\tance is found to have a mass of 25 g after being dried in an oven at 105°C for 2 hours. What is the percentage of water in the subs\tance?
A. 20%
Correct B. 30%
C. 40%
D. 50%

Correct Answer: B

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Question 14 View Details
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 15 View Details
A 5 L solution of 0.2 M glu\cose is diluted to 10 L. What is the concentration of glu\cose in the final solution?
Correct A. 0.1 M
B. 0.05 M
C. 0.02 M
D. 0.01 M

Correct Answer: A

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Question 16 View Details
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To pump protons across the mitochondrial inner membrane
C. To reduce NADH and FADH2 to NAD+ and FAD
Correct D. To produce water and ATP through oxidative phosphorylation

Correct Answer: D

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Question 17 View Details
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this bacterium?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
Correct D. Vancomycin

Correct Answer: D

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Question 18 View Details
A diagram of the human circulatory system is shown below. Which of the following structures is responsible for the regulation of blood pressure?
A. Aorta
B. Pulmonary artery
C. Renal arteries
Correct D. Baroreceptors in the carotid \sinus

Correct Answer: D

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Question 19 View Details
A diagram of the human digestive system is shown below. Which of the following structures is responsible for the breakdown of proteins?
A. Salivary glands
B. Pancreas
C. Liver
Correct D. Pep\sin in the stomach

Correct Answer: D

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Question 20 View Details
A diagram of the human nervous system is shown below. Which of the following structures is responsible for the transmission of nerve impulses?
A. D\endrites
B. Axon terminals
Correct C. Synapses
D. Myelin sheath

Correct Answer: C

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Question 21 View Details
The process of osmoregulation in animals involves the regulation of water and salt balance in the body. Which of the following is a key component of the osmoregulatory system in humans?
Correct A. Kidneys
B. Liver
C. Pancreas
D. Skin

Correct Answer: A

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Question 22 View Details
In the context of evolutionary theory, what is the term for the process by which a species becomes reproductively isolated from other species, leading to the formation of new species?
Correct A. Speciation
B. Adaptation
C. Mutation
D. Genetic Drift

Correct Answer: A

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Question 23 View Details
In the e\cosystem of a coral reef, what is the primary role of the coral polyps?
A. Primary Producers
B. Primary Consumers
C. Decomposers
Correct D. Symbiotic Organisms

Correct Answer: D

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Question 24 View Details
In the context of excretion, what is the primary function of the kidneys in the human body?
Correct A. To filter waste products from the blood
B. To regulate blood pressure
C. To produce hormones
D. To produce bile

Correct Answer: A

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Question 25 View Details
In the context of reproduction, what is the term for the process by which an organism produces offspring without the involvement of gametes?
Correct A. Asexual Reproduction
B. Sexual Reproduction
C. Mutation
D. Genetic Drift

Correct Answer: A

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