POST UTME MADONNA UNIVERSITY 2023 Biology | Objective

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Question 1
In a population of Drosophila melanogaster, a genetic cross between two heterozygous individuals (AaBbCc) results in offspring with the following phenotypes: 25% AaBbCc, 50% AaBbCc, 12.5% AaBbCc, and 12.5% AaBbCc. What is the probability of an offspring inheriting the genotype AaBbCc?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.875

Correct Answer: A

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Question 2
A 2.5-liter solution of 0.5 M NaCl is diluted by adding 2.5 liters of water. What is the new concentration of NaCl in the solution?
Correct A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: A

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Question 3
A diagram of a plant cell is shown. Identify the organelle responsible for protein synthesis.
A. Nucleus
Correct B. Ribosome
C. Mitochondria
D. Endoplasmic reticulum

Correct Answer: B

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Question 4
A 50-mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 25 mL of NaOH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 5
A diagram of a human eye is shown. Identify the part of the eye responsible for detecting light.
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 6
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Reabsorption of ions in the proximal convoluted tubule
B. Secretion of ions in the distal convoluted tubule
C. Reabsorption of ions in the loop of Henle
D. Excretion of ions in the collecting duct

Correct Answer: A

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Question 7
What is the primary function of the mitochondria in the process of cellular respiration?
Correct A. To generate ATP through the citric acid cycle
B. To produce NADH and FADH2 through glycolysis
C. To regulate the concentration of ions in the cell
D. To synthesize proteins through translation

Correct Answer: A

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Question 8
In the context of tissue engineering, what is the primary advantage of u\sing a scaffold made of a biodegradable polymer?
A. It allows for the controlled release of growth factors
Correct B. It provides a temporary framework for cell attachment and growth
C. It promotes the formation of a stable blood clot
D. It inhibits the growth of surrounding tissue

Correct Answer: B

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Question 9
What is the primary mechanism by which the liver regulates the concentration of glu\cose in the blood?
A. Through the release of insulin
Correct B. Through the release of glucagon
C. Through the breakdown of glycogen
D. Through the synthesis of glu\cose

Correct Answer: B

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Question 10
In the context of eco\logy, what is the primary advantage of u\sing a food web to represent the relationships between species?
Correct A. It allows for the visualization of complex relationships between species
B. It provides a quantitative measure of the energy flow through the e\cosystem
C. It identifies the keystone species in the e\cosystem
D. It predicts the long-term stability of the e\cosystem

Correct Answer: A

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Question 11
In the context of eco\logy, what is the primary function of a keystone species?
Correct A. To maintain the balance of the e\cosystem
B. To regulate the population of other species
C. To provide a source of food for other species
D. To create a habitat for other species

Correct Answer: A

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Question 12
A researcher is studying the effects of pollution on a population of birds. Which of the following statistical methods would be most appropriate for analyzing the data?
A. Regression analysis
B. ANOVA
C. T-test
Correct D. Correlation analysis

Correct Answer: D

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Question 13
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate the amount of light entering the eye
D. To produce tears

Correct Answer: A

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Question 14
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what will be the population after 6 hours?
A. 1000
B. 2000
C. 4000
Correct D. 8000

Correct Answer: D

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Question 15
A researcher is studying the effect of a new medication on blood pressure. Which of the following statistical methods would be most appropriate for analyzing the data?
A. Regression analysis
B. ANOVA
C. T-test
Correct D. Repeated measures ANOVA

Correct Answer: D

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Question 16
In the context of evolutionary theory, what is the primary mechanism by which genetic drift influences the frequency of alleles in a population?
A. Mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 17
A researcher is studying the effects of a new antibiotic on a bacterial population. Which of the following would be the most appropriate statistical test to use?
A. t-test
B. ANOVA
C. Regression analysis
Correct D. Chi-squared test

Correct Answer: D

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Question 18
A cell is placed in a solution with a high concentration of glu\cose. Which of the following would be the most likely outcome?
A. The cell will undergo apoptosis
B. The cell will undergo mitosis
C. The cell will undergo \endocytosis
Correct D. The cell will undergo osmosis

Correct Answer: D

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Question 19
A researcher is studying the effects of a new pesticide on a population of insects. Which of the following would be the most appropriate statistical test to use?
A. t-test
B. ANOVA
C. Regression analysis
Correct D. Chi-squared test

Correct Answer: D

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Question 20
A cell is placed in a solution with a high concentration of salt. Which of the following would be the most likely outcome?
A. The cell will undergo apoptosis
B. The cell will undergo mitosis
C. The cell will undergo \endocytosis
Correct D. The cell will undergo osmosis

Correct Answer: D

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Question 21
In a photosynthetic pathway, which of the following is the primary function of the enzyme RuBisCO?
Correct A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH

Correct Answer: A

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Question 22
In a typical terrestrial e\cosystem, which of the following biomes is characterized by a high level of rainfall and a dense canopy?
Correct A. Tropical Rainforest
B. Temperate Rainforest
C. Desert
D. Grassland

Correct Answer: A

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Question 23
In a human body, which of the following hormones is primarily responsible for regulating blood sugar levels?
Correct A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroid Hormone

Correct Answer: A

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Question 24
In a typical cell, which of the following organelles is responsible for protein synthesis?
A. Mitochondria
B. Endoplasmic Reticulum
Correct C. Ribosomes
D. Lysosomes

Correct Answer: C

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Question 25
In a typical e\cosystem, which of the following biotic factors is responsible for the decomposition of organic matter?
A. Producers
B. Consumers
Correct C. Decomposers
D. Nutrient Cycles

Correct Answer: C

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