POST UTME COVENANT UNIVERSITY 2023 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. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 3
The diagram below shows the life cycle of a bacterium. Which stage is responsible for the production of spores?
A. Vegetative stage
B. Spore stage
Correct C. Endospore stage
D. Germination stage

Correct Answer: C

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Question 4
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. 0.24
C. 0.36
D. 0.48

Correct Answer: B

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Question 5
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord

Correct Answer: A

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Question 6
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the flower color, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the offspring of a heterozygous individual and a homozygous recessive individual?
A. Homozygous dominant, purple flower
B. Homozygous recessive, white flower
Correct C. Heterozygous, pink flower
D. Homozygous dominant, white flower

Correct Answer: C

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Question 7
A 2.5 L flask contains 2.0 mol of an ideal gas at 27°C. If 1.5 mol of the gas is removed, what is the new pressure of the gas?
A. 2.5 atm
Correct B. 1.5 atm
C. 0.5 atm
D. 1.0 atm

Correct Answer: B

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Question 8
A 50-year-old woman has a 5-year history of type 2 diabetes. She has a body mass index (BMI) of 35 kg/m² and a waist circumference of 120 cm. What is her risk of developing cardiovascular disease?
Correct A. High risk
B. Moderate risk
C. Low risk
D. Very low risk

Correct Answer: A

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Question 9
A 30-year-old man has a 10-year history of hypertension. He has a systolic blood pressure of 180 mmHg and a diastolic blood pressure of 100 mmHg. What is his risk of developing kidney disease?
Correct A. High risk
B. Moderate risk
C. Low risk
D. Very low risk

Correct Answer: A

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Question 10
A 40-year-old woman has a 5-year history of asthma. She has a peak expiratory flow rate (PEFR) of 200 L/min. What is her FEV1/FVC ratio?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 11
The process of osmoregulation in animals involves the regulation of water and salt balance in the body. Which of the following is a key mechanism involved in osmoregulation?
Correct A. Active transport of ions across cell membranes
B. Passive diffusion of water across cell membranes
C. Excretion of excess salt through the kidneys
D. Ingestion of salt-rich foods

Correct Answer: A

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Question 12
In the context of hormonal coordination, which of the following hormones is responsible for stimulating the release of insulin from the pancreas?
A. Glucagon
Correct B. Insulin
C. Adrenaline
D. Growth hormone

Correct Answer: B

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Question 13
The process of digestion in the small intestine involves the breakdown of proteins into smaller peptides and amino acids. Which of the following enzymes is primarily responsible for this process?
A. Pep\sin
Correct B. Tryp\sin
C. Chymotryp\sin
D. Lactase

Correct Answer: B

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Question 14
In the context of respiration, which of the following is a key difference between aerobic and anaerobic respiration?
A. Aerobic respiration produces more ATP than anaerobic respiration
B. Anaerobic respiration produces more ATP than aerobic respiration
Correct C. Aerobic respiration occurs in the presence of oxygen, while anaerobic respiration occurs in the absence of oxygen
D. Aerobic respiration is slower than anaerobic respiration

Correct Answer: C

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Question 15
The sense organ responsible for detecting changes in light intensity is the?
Correct A. Eye
B. Ear
C. Nose
D. Skin

Correct Answer: A

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Question 16
In a population of E. coli, the average generation time is 20 minutes. If the population is doubling every 10 minutes, what is the growth rate of the population?
A. 0.05
Correct B. 0.1
C. 0.2
D. 0.5

Correct Answer: B

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Question 17
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7. If the pH of the medium is increased to 8, what is the expected effect on the growth of the microorganism?
A. Increased growth
Correct B. Decreased growth
C. No change in growth
D. Increased death rate

Correct Answer: B

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Question 18
A cell is placed in a medium with a concentration of 0.1 M glu\cose. If the cell takes up glu\cose at a rate of 0.05 M/min, what is the concentration of glu\cose in the medium after 10 minutes?
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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Question 19
A species of plant has a growth rate of 0.2 cm/day. If the plant is 10 cm tall, how long will it take for the plant to reach a height of 20 cm?
A. 5 days
Correct B. 10 days
C. 15 days
D. 20 days

Correct Answer: B

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Question 20
A population of bacteria is growing exponentially with a growth rate of 0.05/min. If the initial population is 100 cells, what is the population after 10 minutes?
A. 1000 cells
B. 5000 cells
Correct C. 10000 cells
D. 50000 cells

Correct Answer: C

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Question 21
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. 0.36
B. 0.64
C. 0.48
D. 0.52

Correct Answer: A

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Question 22
A 5-year-old child is diagnosed with acute lymphoblastic leukemia (ALL). The child's bone marrow biopsy shows a high percentage of blasts. Which of the following is the most likely cause of this condition?
Correct A. Genetic mutation
B. Viral infection
C. Environmental exposure
D. Immunodeficiency

Correct Answer: A

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Question 23
A researcher is studying the effect of temperature on the growth rate of E. coli. The researcher measures the growth rate at different temperatures and plots the data on a graph. Which of the following types of graphs would be most appropriate for this data?
Correct A. Line graph
B. Bar graph
C. Scatter plot
D. Histogram

Correct Answer: A

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Question 24
A patient is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The patient's symptoms include muscle weakness, fatigue, and difficulty swallowing. Which of the following is the most likely cause of this condition?
Correct A. Genetic mutation
B. Environmental exposure
C. Infectious disease
D. Autoimmune disorder

Correct Answer: A

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Question 25
A researcher is studying the effect of pH on the growth of a specific type of bacteria. The researcher measures the growth rate at different pH levels and plots the data on a graph. Which of the following types of graphs would be most appropriate for this data?
Correct A. Line graph
B. Bar graph
C. Scatter plot
D. Histogram

Correct Answer: A

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