POST UTME UNN 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the nephron is shown below. What is the primary function of the thick asc\ending limb of the loop of Henle?
A. To reabsorb water and ions from the filtrate
B. To secrete hydrogen ions into the filtrate
C. To reabsorb glu\cose and amino acids from the filtrate
D. To produce a hypertonic interstitium
Question 2
A 20-year-old athlete is experiencing muscle soreness after exercise. Which of the following is a likely cause of this condition?
A. Muscle fatigue
B. Muscle damage
C. Dehydration
D. Electrolyte imbalance
Question 3
Asexual reproduction in bacteria is an example of what type of reproduction?
A. Mitosis
B. Meiosis
C. Binary Fission
D. Fragmentation
Question 4
The process of osmoregulation in animals involves the regulation of the concentration of solutes in the body fluids. Which of the following is a mechanism of osmoregulation?
A. The excretion of excess water through the kidneys.
B. The reabsorption of excess ions in the kidneys.
C. The excretion of excess ions through the skin.
D. The reabsorption of excess water in the kidneys.
Question 5
The process by which plants convert light energy into chemical energy is called?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Osmosis
Question 6
The process of mitosis in eukaryotic cells involves the division of the nucleus into two daughter nuclei. Which of the following stages of mitosis is responsible for the separation of the chromosomes?
A. Prophase.
B. Metaphase.
C. Anaphase.
D. Telophase.
Question 7
In the context of xylem transport, what is the primary function of the pit membrane?
A. To regulate water flow between adjacent tracheids
B. To facilitate the transfer of minerals from the xylem sap to the surrounding tissues
C. To prevent the collapse of the xylem vessels under negative pressure
D. To allow for the exchange of gases between the xylem and the surrounding tissues
Question 8
The sense organ responsible for detecting changes in light intensity is the?
A. Eye
B. Ear
C. Nose
D. Mouth
Question 9
In the context of cell structure, what is the primary function of the mitochondria in cellular respiration?
A. To produce ATP through oxidative phosphorylation
B. To produce ATP through glycolysis
C. To break down proteins into amino acids
D. To break down carbohydrates into simple sugars
Question 10
A patient has been diagnosed with a bacterial infection. Which of the following is the primary mechanism by which the immune system responds to this infection?
A. Phagocytosis
B. Complement activation
C. Antibody production
D. Cytokine release
Question 11
A cell is placed in a solution with a pH of 4.5. If the cell membrane has a permeability coefficient of 10^-5 cm/s, what is the rate of diffusion of H+ ions across the membrane?
A. 10^-3 cm/s
B. 10^-4 cm/s
C. 10^-5 cm/s
D. 10^-6 cm/s
Question 12
The process of asexual reproduction in which a new individual is formed from a part of a parent's body, such as budding or fragmentation, is an example of what type of reproduction?
A. Binary Fission
B. Mitosis
C. Regeneration
D. Fragmentation
Question 13
A 25-year-old woman presents with primary amenorrhea and a history of recurrent miscarriages. Her karyotype is 45,X. What is the most likely cause of her condition?
A. Turner syndrome
B. Klinefelter syndrome
C. Androgen insensitivity syndrome
D. Swyer syndrome
Question 14
A patient has been diagnosed with a viral infection. Which of the following is the primary mechanism by which the immune system responds to this infection?
A. Phagocytosis
B. Complement activation
C. Antibody production
D. Cytokine release
Question 15
A diagram of the respiratory system is shown below. What is the primary function of the diaphragm?
A. To increase the volume of the thoracic cavity
B. To decrease the volume of the thoracic cavity
C. To facilitate the exchange of gases between the lungs and the atmosphere
D. To regulate the pH of the blood

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