POST UTME LEAD CITY UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The human body is composed of four main types of tissues: epithelial, connective, muscle, and nervous. What is the primary function of epithelial tissue?
A. To provide structural support and maintain the shape of organs
B. To produce hormones and other signaling molecules
C. To form a barrier between the external environment and the internal environment
D. To facilitate the exchange of oxygen and carbon dioxide
Question 2
What is the primary mechanism by which the kidneys regulate blood pH in a person with chronic kidney disease?
A. By increa\sing the excretion of hydrogen ions
B. By increa\sing the reabsorption of hydrogen ions
C. By increa\sing the excretion of bicarbonate ions
D. By increa\sing the reabsorption of bicarbonate ions
Question 3
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst and hunger?
A. To regulate body temperature
B. To control hunger and thirst
C. To regulate blood pressure
D. To regulate electrolyte balance
Question 4
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'RR'?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 5
The process of excretion in the kidney involves the filtration of blood by the glomerulus, which results in the formation of a filtrate that contains water, ions, glu\cose, and other subs\tances. What is the primary function of the renal tubules in the nephron?
A. To reabsorb water and ions back into the bloodstream
B. To secrete waste products into the urine
C. To regulate the pH of the blood
D. To produce hormones that stimulate the release of urine
Question 6
In a person with a head injury, what is the primary function of the cerebellum in regulating balance and coordination?
A. To regulate balance and coordination by integrating sensory information
B. To regulate balance and coordination by producing motor responses
C. To regulate balance and coordination by controlling eye movements
D. To regulate balance and coordination by controlling posture
Question 7
A 2.5 L flask contains 0.5 M HCl. If 1.5 L of the solution is removed and replaced with 1.5 L of 0.5 M NaOH, what is the new concentration of HCl in the flask?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 8
In the process of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by reabsorbing or excreting ions
D. To produce a highly concentrated urine by reabsorbing water from the filtrate
Question 9
In the context of photosynthesis, what is the role of the enzyme RuBisCO in the Calvin cycle?
A. It catalyzes the conversion of CO2 into a 3-carbon molecule.
B. It is responsible for the light-dep\endent reactions.
C. It is involved in the Hill reaction.
D. It is a key enzyme in the C4 pathway.
Question 10
In the context of classification of living things, what is the primary difference between a kingdom and a phylum?
A. A kingdom is a higher taxonomic rank than a phylum
B. A phylum is a higher taxonomic rank than a kingdom
C. A kingdom is a group of related organisms, while a phylum is a group of related species
D. A phylum is a group of related organisms, while a kingdom is a group of related species
Question 11
The human digestive system is responsible for breaking down food into smaller molecules that can be absorbed and utilized by the body. What is the primary function of the small intestine in the digestive process?
A. To absorb nutrients into the bloodstream
B. To break down proteins into amino acids
C. To produce enzymes that facilitate the breakdown of carbohydrates
D. To store undigested food for later use
Question 12
A 50-year-old woman has a family history of breast cancer. Her mother and sister both had breast cancer at the age of 40. What is the probability that she will develop breast cancer by the age of 50?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 13
A 30-year-old female patient presents with a 5-year history of recurrent episodes of hypoglycemia. Her fasting plasma glu\cose level is 70 mg/dL. Which of the following is the most likely diagnosis?
A. Type 1 diabetes mellitus
B. Type 2 diabetes mellitus
C. Insulinoma
D. Glucagonoma
Question 14
In the context of growth and regulation, what is the primary function of the hormone insulin?
A. It stimulates the breakdown of glycogen into glu\cose.
B. It is involved in the regulation of blood sugar levels.
C. It is a key hormone in the C4 pathway.
D. It is a type of growth hormone.
Question 15
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glu\cose. What is the primary reac\tant in the light-dep\endent reactions of photosynthesis?
A. Water (H2O)
B. Carbon dioxide (CO2)
C. Light energy (photons)
D. Oxygen (O2)

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