POST UTME PAN-ATLANTIC UNIVERSITY 2019 Biology | Objective

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Question 1
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood glu\cose levels
Correct C. Stress response and adaptation
D. Regulation of appetite and satiety

Correct Answer: C

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Question 2
A researcher is studying the population dynamics of a species in a tropical rainforest. Which of the following biomes is most likely to be characterized by a high level of \endemism?
A. Temperate grassland
Correct B. Tropical rainforest
C. Desert
D. Temperate deciduous forest

Correct Answer: B

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Question 3
A patient is diagnosed with a bacterial infection caused by a gram-negative bacterium. Which of the following antibiotics is most likely to be effective against this type of infection?
A. Penicillin
Correct B. Ciprofloxacin
C. Vancomycin
D. Metronidazole

Correct Answer: B

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Question 4
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. Which of the following structures is most likely to be involved in this process?
A. Tracheids
Correct B. Vessel elements
C. Xylem parenchyma
D. Phloem sieve cells

Correct Answer: B

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Question 5
A cell is in the process of undergoing mitosis. Which of the following stages is characterized by the condensation of chromatin into visible chromosomes?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 6
In the context of classification of living things, what is the primary function of the kingdom level?
A. To group organisms based on their cell structure
Correct B. To group organisms based on their genetic makeup
C. To group organisms based on their body structure
D. To group organisms based on their metabolic processes

Correct Answer: B

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Question 7
A neuron is stimulated by an action potential that travels along its axon. What is the primary function of the myelin sheath in this context?
Correct A. To increase the speed of the action potential
B. To increase the strength of the action potential
C. To decrease the speed of the action potential
D. To decrease the strength of the action potential

Correct Answer: A

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Question 8
In the context of excretion and osmoregulation, what is the primary function of the kidneys?
A. To regulate the concentration of ions in the blood
B. To regulate the concentration of water in the blood
Correct C. To remove waste products from the blood
D. To regulate the pH of the blood

Correct Answer: C

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Question 9
In the context of nutrition, what is the primary function of chlorophyll in photosynthesis?
A. To absorb light energy from the sun
Correct B. To convert light energy into chemical energy
C. To transport water and minerals to the plant
D. To regulate the temperature of the plant

Correct Answer: B

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Question 10
In the context of respiration and gas exchange, what is the primary function of the alveoli in the lungs?
Correct A. To exchange oxygen and carbon dioxide with the environment
B. To regulate the pH of the blood
C. To remove waste products from the blood
D. To regulate the concentration of ions in the blood

Correct Answer: A

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Question 11
In a photosynthetic pathway, which of the following is the primary electron acceptor in the light-dep\endent reactions?
A. P680
Correct B. P700
C. Pheophytin
D. Plastocyanin

Correct Answer: B

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Question 12
A 20-year-old male patient presents with symptoms of hypogonadism. Which of the following hormones is most likely deficient?
A. Follicle-stimulating hormone (FSH)
Correct B. Luteinizing hormone (LH)
C. Testosterone
D. Growth hormone

Correct Answer: B

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Question 13
A species of bird has a beak shape that is well-suited for cracking open nuts. This is an example of which type of evolutionary adaptation?
A. Convergent evolution
B. Divergent evolution
Correct C. Adaptation
D. Speciation

Correct Answer: C

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Question 14
A cell is placed in a medium with a high concentration of glu\cose. Which of the following is the primary response of the cell?
A. Increase in cell size
Correct B. Increase in cell division
C. Increase in cell death
D. No change

Correct Answer: B

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Question 15
A species of plant has a root system that is well-suited for absorbing water from the soil. This is an example of which type of root system?
Correct A. Taproot
B. Fibrous root
C. Adventitious root
D. Modified root

Correct Answer: A

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Question 16
In a population of 1000 individuals, 60% are heterozygous for the ABO blood group gene, 20% are homozygous dominant, and 20% are homozygous recessive. What is the expected frequency of the A allele?
Correct A. 0.45
B. 0.55
C. 0.65
D. 0.75

Correct Answer: A

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Question 17
A 2-year-old child is brought to the emergency room with a history of recurrent infections. Physical examination reveals a small, underdeveloped spleen. Which of the following is the most likely diagnosis?
A. DiGeorge syndrome
Correct B. Wiskott-Aldrich syndrome
C. X-linked a\gammaglobulinemia
D. Leukocyte adhesion deficiency

Correct Answer: B

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Question 18
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and growth rate?
A. Directly proportional
B. Inversely proportional
C. No relationship
Correct D. U-shaped curve

Correct Answer: D

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Question 19
A 30-year-old woman presents to her gyneco\logist with a history of infertility. Her husband has a normal semen analysis. Which of the following is the most likely cause of her infertility?
A. Tubal ligation
B. Endometriosis
Correct C. Polycystic ovary syndrome
D. Premature ovarian failure

Correct Answer: C

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Question 20
A 40-year-old man is diagnosed with prostate cancer. Which of the following is the most likely histo\logical type of prostate cancer?
Correct A. Adenocarcinoma
B. Squamous cell carcinoma
C. Transitional cell carcinoma
D. Small cell carcinoma

Correct Answer: A

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Question 21
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. 0.8
D. 0.16

Correct Answer: B

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Question 22
A 2.5 kg object is moving in a circular path with a radius of 1.8 m. If the object's speed is 4.2 m/s, what is the magnitude of the centripetal acceleration?
A. 2.5 m/s^2
Correct B. 5.1 m/s^2
C. 10.2 m/s^2
D. 20.4 m/s^2

Correct Answer: B

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Question 23
A solution contains 0.5 M glu\cose and 0.2 M fructose. If 10 mL of this solution is diluted to 100 mL, what is the concentration of glu\cose in the final solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 24
A 5.6 kg block is attached to a horizontal, massless spring with a force cons\tant of 120 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.8 m/s
B. 1.2 m/s
Correct C. 1.6 m/s
D. 2.4 m/s

Correct Answer: C

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Question 25
A 2.2 kg object is moving in a circular path with a radius of 1.5 m. If the object's speed is 3.4 m/s, what is the magnitude of the centripetal acceleration?
A. 1.5 m/s^2
B. 3.0 m/s^2
Correct C. 4.5 m/s^2
D. 6.0 m/s^2

Correct Answer: C

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