POST UTME GREENFIELD UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 40-year-old man presents with a 5-year history of hypertension. His serum creatinine level is elevated, and his pelvic examination is normal. What is the most likely diagnosis?
A. Chronic kidney disease
B. Diabetes mellitus
C. Hypertensive heart disease
D. Pulmonary hypertension
Question 2
A population of 1000 bacteria is growing exponentially with a doubling time of 1 hour. How many bacteria will there be after 3 hours?
A. 2000
B. 4000
C. 6000
D. 8000
Question 3
In a human blood vessel, what is the primary function of the \endothelial cells lining the vessel wall?
A. To regulate blood pressure
B. To facilitate the exchange of oxygen and carbon dioxide
C. To produce thromboxanes
D. To synthesize prostaglandins
Question 4
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
B. 0.64
C. 0.72
D. 0.88
Question 5
A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following genetic traits would be an example of a quantitative trait?
A. Eye color
B. Wing length
C. Body color
D. Sex
Question 6
The human body has a complex system for regulating body temperature. Which of the following statements best describes the role of the hypothalamus in this process?
A. The hypothalamus is responsible for the production of hormones that regulate body temperature.
B. The hypothalamus regulates body temperature through sweating and shivering.
C. The hypothalamus is involved in the regulation of appetite and satiety.
D. The hypothalamus is responsible for the movement of the body's limbs.
Question 7
A researcher is studying the effect of temperature on the rate of photosynthesis in plants. Which of the following is a likely consequence of increa\sing the temperature?
A. Increased stomatal density
B. Decreased chlorophyll content
C. Increased rate of photosynthesis
D. Decreased rate of transpiration
Question 8
A woman has a genetic disorder that affects her ability to digest lactose. She has two children, one of whom is lactose intolerant. What is the probability that her next child will be lactose intolerant?
A. 1/2
B. 1/4
C. 3/4
D. 1/3
Question 9
A 25-year-old woman presents with a 2-year history of amenorrhea. Her serum FSH level is elevated, and her pelvic examination is normal. What is the most likely diagnosis?
A. Premature ovarian failure
B. Polycystic ovary syndrome
C. Hypothalamic amenorrhea
D. Pituitary tumor
Question 10
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'Tt'. What is the probability that the offspring will have the genotype 'tt'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 11
A 10.0 g sample of a compound is found to have a mass of 5.0 g after being dried in an oven at 105°C. What is the percentage of water in the compound?
A. 20%
B. 30%
C. 40%
D. 50%
Question 12
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.36
B. 0.64
C. 0.16
D. 0.04
Question 13
In a population of E. coli, the frequency of the gene for ampicillin resis\tance is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many are expected to be resis\tant?
A. 0
B. 2
C. 200
D. 2000
Question 14
The process of cellular respiration in eukaryotic cells involves the breakdown of glu\cose to produce ATP, which is then used to power the cell's various activities. Which of the following statements best describes the relationship between the electron transport chain and the production of ATP?
A. The electron transport chain generates a proton gradient across the mitochondrial inner membrane, which drives the production of ATP.
B. The electron transport chain is responsible for the breakdown of glu\cose to produce ATP.
C. The electron transport chain is a byproduct of ATP production and has no direct role in its synthesis.
D. The electron transport chain is involved in the production of NADH and FADH2, but not in the production of ATP.
Question 15
The process by which an organism's cells become specialized to perform specific functions is called what?
A. Mitosis
B. Meiosis
C. Differentiation
D. Genetic drift

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