POST UTME RHEMA UNIVERSITY 2020 Biology | Objective

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Question 1
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'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'C'?
A. To focus light on the retina
B. To re\fract light entering the eye
Correct C. To detect light and color
D. To produce tears

Correct Answer: C

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Question 3
The xylem of a plant consists of tracheids, vessels, and xylem parenchyma cells. What is the primary function of the xylem parenchyma cells?
A. To transport water and minerals
Correct B. To store food and water
C. To support the plant's structure
D. To produce hormones

Correct Answer: B

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Question 4
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'D'?
A. To pump blood to the lungs
B. To pump blood to the body
C. To transport oxygenated blood
Correct D. To transport deoxygenated blood

Correct Answer: D

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Question 5
The Hardy-Weinberg principle states that the frequency of alleles in a population remains cons\tant from generation to generation. If the frequency of the dominant allele 'A' is 0.8 and the frequency of the recessive allele 'a' is 0.2, what is the frequency of the heterozygous genotype 'Aa'?
A. 0.16
Correct B. 0.32
C. 0.48
D. 0.64

Correct Answer: B

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Question 6
In the context of respiratory physio\logy, what is the primary function of the diaphragm during inspiration?
A. To increase thoracic pressure
Correct B. To decrease thoracic pressure
C. To maintain cons\tant thoracic pressure
D. To increase abdominal pressure

Correct Answer: B

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Question 7
A patient with a history of chronic bronchitis presents with a productive cough. Which of the following pathogens is most likely responsible for this patient's condition?
A. Streptococcus pneumoniae
Correct B. Haemophilus influenzae
C. Mycoplasma pneumoniae
D. Chlamydophila pneumoniae

Correct Answer: B

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Question 8
A 30-year-old woman presents with a 2-year history of recurrent episodes of vertigo, tinnitus, and hearing loss. Which of the following conditions is most likely responsible for this patient's symptoms?
Correct A. Meniere's disease
B. Labyrinthitis
C. Vestibular schwannoma
D. Acoustic neuroma

Correct Answer: A

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Question 9
A 40-year-old man presents with a 5-year history of progressive difficulty with speech and swallowing. Which of the following conditions is most likely responsible for this patient's symptoms?
Correct A. Amyotrophic lateral sclerosis (ALS)
B. Progressive supranuclear palsy (PSP)
C. Frontotemporal dementia (FTD)
D. Multiple system atrophy (MSA)

Correct Answer: A

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Question 10
A 20-year-old woman presents with a 2-year history of recurrent episodes of abdominal pain, diarrhea, and weight loss. Which of the following conditions is most likely responsible for this patient's symptoms?
Correct A. Crohn's disease
B. Ulcerative colitis
C. Irritable bowel syndrome (IBS)
D. Gastroesophageal reflux disease (GERD)

Correct Answer: A

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Question 11
A study on the evolution of antibiotic resis\tance in bacteria revealed that the rate of resis\tance development is influenced by the frequency of antibiotic use. Which of the following best describes the relationship between antibiotic use and antibiotic resis\tance?
A. The more antibiotics used, the lower the rate of resis\tance development.
Correct B. The more antibiotics used, the higher the rate of resis\tance development.
C. There is no relationship between antibiotic use and resis\tance development.
D. The relationship between antibiotic use and resis\tance development is unclear.

Correct Answer: B

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Question 12
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth of E. coli at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and E. coli growth?
A. The growth of E. coli increases as pH increases.
Correct B. The growth of E. coli decreases as pH increases.
C. The growth of E. coli remains cons\tant regardless of pH.
D. The relationship between pH and E. coli growth is unclear.

Correct Answer: B

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Question 13
A geneticist is studying the inheri\tance of a trait in a population of mice. The geneticist measures the frequency of the trait in different generations and plots the data on a graph. Which of the following best describes the pattern of inheri\tance?
A. The trait is inherited in an autosomal dominant pattern.
Correct B. The trait is inherited in an autosomal recessive pattern.
C. The trait is inherited in a sex-linked pattern.
D. The pattern of inheri\tance is unclear.

Correct Answer: B

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Question 14
A bio\logist is studying the process of photosynthesis in plants. The bio\logist measures the rate of photosynthesis at different light intensities and plots the data on a graph. Which of the following best describes the relationship between light intensity and photosynthesis?
Correct A. The rate of photosynthesis increases as light intensity increases.
B. The rate of photosynthesis decreases as light intensity increases.
C. The rate of photosynthesis remains cons\tant regardless of light intensity.
D. The relationship between light intensity and photosynthesis is unclear.

Correct Answer: A

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Question 15
A geneticist is studying the effect of a mutation on the structure of a protein. The geneticist uses X-ray crystal\lography to determine the structure of the protein and finds that the mutation causes a change in the secondary structure of the protein. Which of the following best describes the effect of the mutation on the protein?
A. The mutation causes a change in the primary structure of the protein.
Correct B. The mutation causes a change in the secondary structure of the protein.
C. The mutation causes a change in the tertiary structure of the protein.
D. The mutation has no effect on the structure of the protein.

Correct Answer: B

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Question 16
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Differential reproduction

Correct Answer: D

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Question 17
A diagram of the human respiratory system is shown below. Which part of the system is responsible for the exchange of oxygen and carbon dioxide?
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 18
The diagram below shows a cross-section of a plant root. Which part of the root is responsible for the absorption of water and minerals?
Correct A. Root hair
B. Cortex
C. Stele
D. Endodermis

Correct Answer: A

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Question 19
A diagram of the human eye is shown below. Which part of the eye is responsible for adjusting the size of the pupil?
A. Cornea
Correct B. Iris
C. Retina
D. Lens

Correct Answer: B

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Question 20
The diagram below shows a cross-section of a kidney. Which part of the kidney is responsible for filtering waste products from the blood?
Correct A. Renal cortex
B. Renal medulla
C. Renal pelvis
D. Calyces

Correct Answer: A

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Question 21
In the context of evolutionary bio\logy, what is the primary mechanism by which genetic drift acts to reduce genetic variation within a population?
A. Mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 22
A researcher is studying the effects of a new medication on blood pressure in a group of patients. Which of the following statistical tests would be most appropriate for analyzing the data?
Correct A. t-test
B. ANOVA
C. Regression analysis
D. Chi-squared test

Correct Answer: A

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Question 23
A cell is placed in a solution with a high concentration of glu\cose. Which of the following processes would be most likely to occur?
Correct A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: A

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Question 24
A population of birds is observed to have a mean wing length of 10 cm with a s\tandard deviation of 2 cm. If a new bird is added to the population with a wing length of 14 cm, what is the new mean wing length?
A. 10.5 cm
Correct B. 11 cm
C. 12 cm
D. 13 cm

Correct Answer: B

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Question 25
A researcher is studying the effects of a new pesticide on a population of insects. Which of the following statistical tests would be most appropriate for analyzing the data?
A. t-test
B. ANOVA
C. Regression analysis
Correct D. Chi-squared test

Correct Answer: D

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