POST UTME CHRISTOPHER UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a simple e\cosystem is shown below. Which of the following organisms is a primary consumer?
A. Herbivore
B. Carnivore
C. Decomposer
D. Producer
Question 2
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. Mitochondria
B. Chloroplast
C. Vacuole
D. Nucleus
Question 3
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following would be the most appropriate way to express the relationship between pH and enzyme activity?
A. pH = -\log10[Enzyme Activity]
B. Enzyme Activity = 10^\( -pH \)
C. pH = \log10[Enzyme Activity]
D. Enzyme Activity = 10^(pH)
Question 4
In a typical mammalian kidney, which of the following structures is primarily responsible for the reabsorption of glu\cose from the filtrate?
A. Proximal convoluted tubule
B. Distal convoluted tubule
C. Loop of Henle
D. Collecting duct
Question 5
A plant grows in a pot with a mixture of soil and sand. The plant's roots absorb water and nutrients from the soil. Which of the following is a characteristic of the plant's roots?
A. They are adapted for gas exchange.
B. They are adapted for water and nutrient absorption.
C. They are adapted for support.
D. They are adapted for reproduction.
Question 6
A 30-year-old woman presents with a 3-year history of recurrent episodes of abdominal pain, diarrhea, and weight loss. On examination, the patient has a characteristic 'cobblestone' appearance of the colon. Which of the following is the most likely diagnosis?
A. Ulcerative Colitis
B. Crohn's Disease
C. Irritable Bowel Syndrome (IBS)
D. Gastroesophageal Reflux Disease (GERD)
Question 7
A 2.0 L flask contains 1.0 mol of an ideal gas at 298 K. If the gas is allowed to expand to 4.0 L at cons\tant temperature, what is the new pressure?
A. 0.25 atm
B. 0.5 atm
C. 0.75 atm
D. 1 atm
Question 8
A 2.0-L sample of a gas at 25°C and 1.0 atm is compressed to 0.5 L. What is the new pressure of the gas?
A. 2.0 atm
B. 4.0 atm
C. 6.0 atm
D. 8.0 atm
Question 9
A species of bird has a beak that is perfectly adapted for cracking open nuts. What type of natural selection is occurring in this scenario?
A. Artificial selection
B. Natural selection
C. Genetic drift
D. Gene flow
Question 10
A 20-year-old male patient presents with a 2-year history of progressive weakness of the proximal muscles of the lower limbs. On examination, the patient has a characteristic 'pseudohypertrophy' of the muscles of the lower limbs. Which of the following is the most likely diagnosis?
A. Duchenne Muscular Dystrophy
B. Becker Muscular Dystrophy
C. Myotonic Dystrophy
D. Spinal Muscular Atrophy
Question 11
A 5% solution of glu\cose in water has a density of 1.05 g/mL. If 250 mL of this solution is diluted to 1 L, what is the concentration of glu\cose in the final solution?
A. 0.5%
B. 1%
C. 1.5%
D. 2%
Question 12
In a forest e\cosystem, the presence of a keystone species can have a cascading effect on the entire food chain. Which of the following is an example of a keystone species?
A. Wolves in Yellowstone National Park
B. Grizzly bears in the Rocky Mountains
C. Mountain lions in the Sierra Nevada
D. Coyotes in the Sonoran Desert
Question 13
In a population of 1000 individuals, 200 are heterozygous for the gene controlling the production of a certain enzyme. If the gene is inherited in a simple M\endelian fashion, what is the probability that two heterozygous individuals will produce a homozygous recessive offspring?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 14
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
Question 15
A species of fish has a unique adaptation that allows it to change the color of its skin to bl\end in with its surroundings. What type of adaptation is this?
A. Mimicry
B. Camouflage
C. Warning coloration
D. Courtship display

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