POST UTME UNIBEN 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the human body, the pancreas secretes two main hormones: insulin and glucagon. What is the primary function of insulin?
A. To regulate blood sugar levels
B. To stimulate digestion
C. To stimulate the heart rate
D. To regulate body temperature
Question 2
The human body is composed of various systems, including the circulatory, respiratory, and digestive systems. Which of the following is a key function of the circulatory system?
A. To regulate body temperature
B. To transport oxygen and nutrients to cells
C. To remove waste products from the body
D. To produce hormones that control growth and development
Question 3
A diagram of a simple e\cosystem is shown below. What is the role of the decomposers in this e\cosystem?
A. To break down dead organic matter into simpler compounds
B. To synthesize complex organic molecules from inorganic compounds
C. To produce oxygen through photosynthesis
D. To consume other organisms for energy
Question 4
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 5
A 30-year-old woman presents with a 6-month history of recurrent episodes of abdominal pain and diarrhea. Her stool culture shows the presence of Escherichia coli. What is the likely diagnosis?
A. Irritable bowel syndrome
B. Inflammatory bowel disease
C. Gastroenteritis
D. Bacterial dysentery
Question 6
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 dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 7
In the context of photosynthesis, what is the role of the enzyme RuBisCO in the Calvin cycle?
A. It catalyzes the fixation of CO2 into a 3-carbon molecule.
B. It is involved in the light-dep\endent reactions of photosynthesis.
C. It is a key enzyme in the breakdown of starch to glu\cose.
D. It is responsible for the reduction of NADP+ to NADPH.
Question 8
A 50-year-old man presents with a 2-year history of progressive weakness and fatigue. His hemoglobin level is 8 g/dL. What is the likely diagnosis?
A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Thalassemia major
D. Sickle cell anemia
Question 9
A patient is diagnosed with a condition characterized by the presence of abnormal proteins in the brain. Which of the following is a likely cause of this condition?
A. A genetic mutation in the gene encoding the protein.
B. A viral infection that causes the production of abnormal proteins.
C. A bacterial infection that leads to inflammation in the brain.
D. A nutritional deficiency that affects protein synthesis.
Question 10
A 2.5 L solution of 0.1 M NaCl is diluted to a total volume of 5 L. What is the concentration of NaCl in the final solution?
A. 0.02 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 11
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of gas is added to the flask, what is the new pressure?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 12
The human eye has a unique structure that allows it to detect light and transmit visual information to the brain. What is the primary function of the retina?
A. To focus light onto the retina
B. To transmit visual information to the brain
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye
Question 13
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 14
In a typical e\cosystem, what is the primary role of decomposers in the nutrient cycle?
A. To break down dead organic matter into simpler compounds
B. To synthesize complex organic molecules from inorganic compounds
C. To produce oxygen through photosynthesis
D. To consume other organisms for energy
Question 15
The process of respiration in plants occurs in the mitochondria.
A. True
B. False
C. The process of respiration in plants occurs in the chloroplasts
D. The process of respiration in plants occurs in the cytoplasm

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