POST UTME CHRISTOPHER UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 bacteria, 80% are sensitive to antibiotic A, 10% are resis\tant to antibiotic B, and 5% are resis\tant to both. If 200 bacteria are treated with antibiotic A, what is the expected number of bacteria that will be resis\tant to both antibiotics after treatment?
A. 80
B. 120
C. 160
D. 200
Question 2
The process of osmoregulation in the human body involves the regulation of which of the following?
A. Water balance
B. Electrolyte balance
C. pH balance
D. All of the above
Question 3
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. What is the expected frequency of the homozygous recessive genotype 'bb'?
A. 0.04
B. 0.08
C. 0.12
D. 0.16
Question 4
A 2.5 L flask contains 1.8 mol of an ideal gas at 27°C. If 1.2 mol of the gas is removed, what is the new pressure of the gas?
A. 1.33 \times 10^5 Pa
B. 1.67 \times 10^5 Pa
C. 2.00 \times 10^5 Pa
D. 2.50 \times 10^5 Pa
Question 5
A 2.5 cm long muscle fiber is stretched to 2.8 cm. If the force of contraction is 10 N, what is the velocity of the muscle fiber?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 6
The diagram below shows the structure of a plant cell. Identify the organelle responsible for protein synthesis.
A. Nucleus
B. Ribosome
C. Mitochondria
D. Endoplasmic reticulum
Question 7
The process by which plants convert light energy into chemical energy is known as?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation
Question 8
The human body has a unique system that helps to maintain homeostasis by regulating the amount of water in the body. What is the name of this system?
A. Nervous system
B. Circulatory system
C. Endocrine system
D. Integumentary system
Question 9
A 2-year-old child is brought to the pediatrician with a history of recurrent ear infections. The child's mother has a family history of hearing loss and has undergone a genetic test that revealed a mutation in the GJB2 gene. What is the most likely diagnosis?
A. Congenital Rubella Syndrome
B. GJB2-related hearing loss
C. Otosclerosis
D. Ménière's disease
Question 10
In a tropical rainforest, the primary consumers are primarily composed of which of the following?
A. Herbivorous insects
B. Fruit-eating birds
C. Fungi and detritivores
D. Large carnivorous mammals
Question 11
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 10 μmol CO2 s-1
B. 20 μmol CO2 s-1
C. 40 μmol CO2 s-1
D. 80 μmol CO2 s-1
Question 12
A diagram shows a simple optical system with a convex lens and a light source. If the light source is moved closer to the lens, what is the likely effect on the image formed by the lens?
A. The image will become larger
B. The image will become smaller
C. The image will not be affected
D. The image will become inverted
Question 13
A 20-year-old woman presents with a 6-month history of recurrent episodes of abdominal pain, nausea, and vomiting. Her physical examination reveals a palpable mass in the right lower quadrant. Which of the following is the most likely diagnosis?
A. App\endicitis
B. Ovarian torsion
C. Ectopic pregnancy
D. Inflammatory bowel disease
Question 14
A 5 μg sample of a protein is separated by SDS-PAGE and the resulting gel is stained with Coomassie Blue. If the protein has a molecular weight of 50 kDa, what is the expected migration dis\tance of the protein in the gel?
A. 0.2 cm
B. 0.3 cm
C. 0.5 cm
D. 0.7 cm
Question 15
A researcher is studying the effect of pH on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and lowest at pH 5, what can be concluded about the effect of pH on the growth of the microorganism?
A. pH has a positive effect on the growth of the microorganism
B. pH has a negative effect on the growth of the microorganism
C. pH has no effect on the growth of the microorganism
D. The data is inconclusive

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