POST UTME CHRISTOPHER UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. What is the expected frequency of the homozygous recessive genotype 'aa' in the next generation?
A. 0.16
B. 0.32
C. 0.48
D. 0.64
Question 2
A 30-year-old woman presents with symptoms of polycystic ovary syndrome (PCOS). The patient's medical history reveals a family history of PCOS and a history of insulin resis\tance. What is the most likely underlying mechanism of PCOS?
A. Hyperandrogenism
B. Insulin resis\tance
C. Hypothyroidism
D. Hypogonadism
Question 3
A diagram shows a cross-section of a plant root with a xylem and phloem tissue. If the xylem tissue is damaged, what is the likely effect on the plant?
A. The plant will grow faster
B. The plant will grow slower
C. The plant will not be affected
D. The plant will die
Question 4
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B) and 30% have the recessive allele (b). If two individuals with brown eye color are randomly selected for a study, what is the probability that they are both homozygous dominant (BB)?
A. 0.49
B. 0.51
C. 0.7
D. 0.3
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
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 7
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 8
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if the following conditions are met. Which of the following is NOT one of the conditions?
A. Random mating
B. No mutation
C. No gene flow
D. No natural selection
Question 9
A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the growth of the microorganism at different temperatures.
A. The growth of the microorganism is highest at 25°C.
B. The growth of the microorganism is highest at 30°C.
C. The growth of the microorganism is highest at 35°C.
D. The growth of the microorganism is highest at 40°C.
Question 10
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 11
A 30-year-old man presents with a 2-year history of progressive weakness and fatigue. His physical examination reveals a palpable goiter. Which of the following is the most likely diagnosis?
A. Thyroiditis
B. Thyroid cancer
C. Hypothyroidism
D. Hyperthyroidism
Question 12
A 35-year-old man presents with a 2-year history of progressive dyspnea on exertion. His chest radiograph shows a large right-sided pleural effusion. Which of the following is the most likely diagnosis?
A. Lung cancer
B. Pleural mesothelioma
C. Chronic obstructive pulmonary disease (COPD)
D. Pulmonary embolism
Question 13
A patient has been diagnosed with a bacterial infection. The doctor prescribes a course of antibiotics. What is the expected effect of the antibiotics on the bacterial population?
A. The bacterial population will decrease exponentially.
B. The bacterial population will increase exponentially.
C. The bacterial population will remain cons\tant.
D. The bacterial population will oscillate.
Question 14
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 15
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

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