POST UTME COAL CITY UNIVERSITY 2023 Biology | Objective
Practice these randomly selected questions to test your readiness.
Question 1
In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled between organisms?
Question 2
A 5-year-old child is brought to the doctor with a history of frequent infections. The child's white blood cell count is 10,000 cells/μL, and the differential count shows 70% neutrophils, 20% lymphocytes, and 10% monocytes. What is the most likely diagnosis?
Question 3
In a typical human kidney, the glomerular filtration rate (GFR) is approximately 120 mL/min. If the blood pressure is 120/80 mmHg, and the osmotic pressure of the blood is 25 atm, what is the rate of water reabsorption in the proximal convoluted tubule?
Question 4
A plant has a xylem sap concentration of 0.5 M. If the plant is under drought stress, what is the expected change in xylem sap concentration?
Question 5
The process of nutrient cycling in e\cosystems is primarily driven by
Question 6
The e\cosystem's nutrient cycle is primarily driven by
Question 7
A 40-year-old man presents to the clinic with a 6-month history of progressive shortness of breath, fatigue, and weight loss. His physical examination reveals a 3/6 systolic ejection murmur at the left upper sternal border. His electrocardiogram shows a left ventricular hypertrophy pattern. What is the most likely diagnosis?
Question 8
A researcher is studying the effect of pH on the activity of the enzyme lactase. The enzyme's activity is measured in units of substrate converted per hour. If the enzyme's activity at pH 4.5 is 0.8 units/hour, and the enzyme's activity at pH 6.5 is 1.2 units/hour, what is the pH at which the enzyme's activity is 50% of its maximum value?
Question 9
A 30-year-old woman presents to the emergency department with a 2-day history of severe abdominal pain, nausea, and vomiting. She has a history of peptic ulcer disease and is taking omeprazole. Her vital signs are: temperature 38.5°C, pulse 120 beats/min, blood pressure 90/60 mmHg, and respiratory rate 24 breaths/min. What is the most likely diagnosis?
Question 10
In a population of E. coli bacteria, the average generation time is 30 minutes. If the population is initially 10^5 cells, and the growth rate is 0.5 h^-1, what is the population size after 2 hours?
Question 11
A 50-year-old male patient is diagnosed with type 2 diabetes mellitus. His fasting blood glu\cose level is 250 mg/dL. If he is prescribed metformin 500 mg twice daily, what is the expected decrease in blood glu\cose level after 1 week of treatment?
Question 12
A diagram of the human eye is shown below. Identify the part labeled 'A'.
Question 13
The population growth rate is affected by
Question 14
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'?
Question 15
In a population of 1000 individuals, 20% are heterozygous for a particular gene, 40% are homozygous dominant, and 40% are homozygous recessive. What is the genotype and phenotype of the offspring when two heterozygous individuals are crossed?
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