POST UTME CHRISTOPHER UNIVERSITY 2023 Biology | Objective

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Question 1
In a population of 1000 individuals, 70% have the genotype AA, 20% have the genotype Aa, and 10% have the genotype aa. What is the frequency of the recessive allele 'a'?
Correct A. 0.10
B. 0.20
C. 0.30
D. 0.40

Correct Answer: A

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Question 2
A diagram of a plant cell is shown below. Identify the organelle labeled 'X'.
A. Mitochondria
B. Chloroplast
C. Vacuole
Correct D. Plastid

Correct Answer: D

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Question 3
A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?
Correct A. 2
B. 4
C. 6
D. 8

Correct Answer: A

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Question 4
A diagram of a titration setup is shown below. What is the volume of the acid added?
A. 20
Correct B. 30
C. 40
D. 50

Correct Answer: B

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Question 5
A diagram of a population growth curve is shown below. What is the carrying capacity of the population?
A. 100
B. 200
Correct C. 300
D. 400

Correct Answer: C

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Question 6
In a population of Drosophila melanogaster, the frequency of the 'bar' eye trait is 0.2. If the population size is 1000, how many individuals are expected to have the 'bar' eye trait?
A. 100
Correct B. 200
C. 400
D. 800

Correct Answer: B

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Question 7
A 2.5 L container holds 2.0 mol of an ideal gas at 298 K. What is the pressure of the gas?
A. 1.01 x 10^5 Pa
Correct B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa

Correct Answer: B

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Question 8
A 50 kg person is s\tanding on a scale in an elevator. If the elevator accelerates upward at 2 m/s^2, what is the reading on the scale?
A. 550 N
B. 600 N
Correct C. 650 N
D. 700 N

Correct Answer: C

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Question 9
A solution contains 0.1 M NaCl. What is the concentration of Cl^- ions?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 10
A 5.0 L container holds 3.0 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.01 x 10^5 Pa
B. 2.02 x 10^5 Pa
Correct C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa

Correct Answer: C

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Question 11
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected genotype and phenotype distribution in the F1 generation?
Correct A. AA: 60%, Aa: 40%
B. aa: 40%, Aa: 60%
C. AA: 40%, Aa: 60%
D. aa: 60%, Aa: 40%

Correct Answer: A

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Question 12
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the mutated gene. What is the probability that their next child will be affected by the disorder?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 13
A researcher is studying the effect of a new medication on blood pressure in a group of patients. The data shows a significant decrease in blood pressure after treatment. However, the researcher notices that the data points are not normally distributed. What statistical test would be most appropriate to use?
A. t-test
B. ANOVA
C. Kruskal-Wallis
Correct D. Wilcoxon rank-sum test

Correct Answer: D

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Question 14
A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the mutated gene. What is the probability that their next child will be affected by the disorder?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 15
A researcher is studying the effect of a new medication on blood pressure in a group of patients. The data shows a significant decrease in blood pressure after treatment. However, the researcher notices that the data points are not normally distributed. What statistical test would be most appropriate to use?
A. t-test
B. ANOVA
C. Kruskal-Wallis
Correct D. Wilcoxon rank-sum test

Correct Answer: D

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Question 16
The process of meiosis in a eukaryotic cell results in the production of four haploid daughter cells, each with half the number of chromosomes as the parent cell. Which of the following statements is true regarding the genetic variation introduced by meiosis?
Correct A. Meiosis introduces genetic variation by shuffling the parental chromosomes.
B. Meiosis introduces genetic variation by increa\sing the number of chromosomes in the daughter cells.
C. Meiosis introduces genetic variation by decrea\sing the number of chromosomes in the daughter cells.
D. Meiosis does not introduce genetic variation.

Correct Answer: A

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Question 17
In a population of birds, the frequency of the dominant allele for beak shape is 0.6, and the frequency of the recessive allele is 0.4. What is the expected frequency of the heterozygous genotype in the population?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 18
A scientist is studying the structure of a plant cell. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Vacuole
D. Nucleus

Correct Answer: B

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Question 19
A population of rabbits is growing according to the \logistic growth model. The carrying capacity of the population is 1000 rabbits, and the initial population size is 100 rabbits. What is the expected population size after 5 generations?
A. 500
B. 750
Correct C. 1000
D. 1250

Correct Answer: C

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Question 20
A scientist is studying the structure of a human cell. Which of the following organelles is responsible for protein synthesis?
A. Mitochondria
Correct B. Ribosome
C. Vacuole
D. Nucleus

Correct Answer: B

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Question 21
The bacterium Escherichia coli (E. coli) is a common inhabi\tant of the human gut. It plays a crucial role in the breakdown of complex carbohydrates. Which of the following enzymes is primarily responsible for the breakdown of starch in E. coli?
Correct A. Amylase
B. Lactase
C. Maltase
D. Sucrase

Correct Answer: A

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Question 22
The process of osmoregulation in animals involves the regulation of water and electrolyte balance. Which of the following structures is primarily responsible for the excretion of excess water in the human body?
Correct A. Kidneys
B. Liver
C. Pancreas
D. Skin

Correct Answer: A

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Question 23
The classification of living organisms into kingdoms is based on their cell structure and mode of nutrition. Which of the following kingdoms includes organisms that are unicellular, eukaryotic, and have a cell wall made of cellulose?
A. Animalia
B. Fungi
Correct C. Plantae
D. Protista

Correct Answer: C

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Question 24
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key mechanism of evolution that leads to the adaptation of organisms to their environment?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Natural selection

Correct Answer: D

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Question 25
The human eye is a complex sensory organ that allows us to perceive light and color. Which of the following structures is responsible for the accommodation of light in the human eye?
A. Cornea
B. Iris
Correct C. Lens
D. Retina

Correct Answer: C

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