POST UTME MADONNA UNIVERSITY 2017 Biology | Objective

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Question 1
The process of natural selection can be described as a mechanism of evolution that favors the survival and reproduction of individuals with traits that are better suited to their environment. Which of the following is a key component of this process?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Variation in population size

Correct Answer: D

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Question 2
In the context of cellular respiration, what is the primary function of the electron transport chain?
Correct A. To generate ATP
B. To produce NADH
C. To synthesize glu\cose
D. To break down proteins

Correct Answer: A

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Question 3
The Hardy-Weinberg principle states that a population will be in genetic equilibrium if it meets certain conditions. Which of the following is NOT one of these conditions?
A. Random mating
B. No mutation
C. No gene flow
Correct D. No natural selection

Correct Answer: D

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Question 4
The process of mitosis results in the production of daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the separation of chromosomes?
A. Prophase
B. Metaphase
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 5
The concept of symbiotic relationships in bio\logy refers to the close and often long-term interactions between different species. Which of the following is an example of a mutualistic symbiotic relationship?
A. Predation
B. Commensalism
Correct C. Mutualism
D. Parasitism

Correct Answer: C

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Question 6
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of photosynthesis?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 7
In the human body, the nervous system and the \endocrine system work together to regulate various bodily functions. Which of the following is an example of a hormone that is produced by the pituitary gland?
Correct A. Adrenocorticotropic hormone (ACTH)
B. Follicle-stimulating hormone (FSH)
C. Luteinizing hormone (LH)
D. Thyroid-stimulating hormone (TSH)

Correct Answer: A

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Question 8
The human digestive system is responsible for breaking down food into smaller molecules that can be absorbed and utilized by the body. Which of the following is an example of a digestive enzyme that is produced by the pancreas?
Correct A. Amylase
B. Lipase
C. Tryp\sin
D. Chymotryp\sin

Correct Answer: A

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Question 9
The process of asexual reproduction in plants involves the production of offspring that are genetically identical to the parent plant. Which of the following is an example of a type of asexual reproduction in plants?
Correct A. Budding
B. Fragmentation
C. Runners
D. Spores

Correct Answer: A

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Question 10
The human immune system is responsible for protecting the body against pathogens and other foreign subs\tances. Which of the following is an example of a type of immune cell that plays a key role in the immune response?
Correct A. Macrophage
B. Neutrophil
C. T cell
D. B cell

Correct Answer: A

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Question 11
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
B. Gene flow
C. Genetic drift
Correct D. Genetic recombination

Correct Answer: D

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Question 12
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's turgor pressure?
Correct A. Increase
B. Decrease
C. Remain the same
D. Become negative

Correct Answer: A

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Question 13
A diagram of a human respiratory system is shown below. Which part of the diagram is responsible for the exchange of oxygen and carbon dioxide?
Correct A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi

Correct Answer: A

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Question 14
A diagram of a human reproductive system is shown below. Which part of the diagram is responsible for the production of sperm?
Correct A. Testes
B. Epididymis
C. Vas deferens
D. Prostate gland

Correct Answer: A

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Question 15
A diagram of a human circulatory system is shown below. Which part of the diagram is responsible for the regulation of blood pressure?
Correct A. Heart
B. Arteries
C. Capillaries
D. Veins

Correct Answer: A

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Question 16
In a population of 1000 individuals, 60% are heterozygous for the gene controlling the production of the enzyme lactase. If 80% of the population is lactose intolerant, what is the probability that a randomly selected individual is homozygous recessive for the gene?
Correct A. 0.06
B. 0.08
C. 0.12
D. 0.16

Correct Answer: A

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Question 17
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of E. coli at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and lowest at pH 5, what can be concluded about the effect of pH on the growth of E. coli?
A. pH has a positive effect on the growth of E. coli
Correct B. pH has a negative effect on the growth of E. coli
C. pH has no effect on the growth of E. coli
D. The effect of pH on the growth of E. coli is dep\endent on the concentration of nutrients

Correct Answer: B

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Question 18
A patient is diagnosed with a bacterial infection. The patient's blood sample is sent to a laboratory for analysis. The laboratory technician performs a Gram stain on the sample and observes that the bacteria are Gram-positive. What can be concluded about the type of bacteria present?
Correct A. The bacteria are Staphylococcus aureus
B. The bacteria are Streptococcus pneumoniae
C. The bacteria are Escherichia coli
D. The bacteria are Klebsiella pneumoniae

Correct Answer: A

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Question 19
A researcher is studying the effect of temperature on the growth of yeast. The researcher measures the growth rate of yeast at different temperatures and plots the data on a graph. If the growth rate is highest at 30°C and lowest at 20°C, what can be concluded about the effect of temperature on the growth of yeast?
Correct A. Temperature has a positive effect on the growth of yeast
B. Temperature has a negative effect on the growth of yeast
C. Temperature has no effect on the growth of yeast
D. The effect of temperature on the growth of yeast is dep\endent on the concentration of nutrients

Correct Answer: A

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Question 20
A patient is diagnosed with a viral infection. The patient's blood sample is sent to a laboratory for analysis. The laboratory technician performs a PCR (polymerase chain reaction) test on the sample and observes that the virus is present. What can be concluded about the type of virus present?
A. The virus is HIV
B. The virus is Hepatitis B
Correct C. The virus is Influenza A
D. The virus is Herpes simplex

Correct Answer: C

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Question 21
In the context of respiration, what is the primary function of the mitochondria?
Correct A. To synthesize ATP from ADP and Pi
B. To break down glu\cose to pyruvate
C. To transport oxygen from the lungs to the tissues
D. To regulate blood pH levels

Correct Answer: A

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Question 22
A diagram of the xylem and phloem is shown below. What is the primary function of the xylem?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To regulate water loss through transpiration
D. To support the structure of the plant

Correct Answer: A

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Question 23
In the context of sense organs, what is the primary function of the retina?
Correct A. To detect light and transmit signals to the brain
B. To regulate blood pressure and heart rate
C. To filter out harmful subs\tances from the blood
D. To produce tears and maintain eye health

Correct Answer: A

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Question 24
A diagram of the water cycle is shown below. What is the primary function of evaporation?
A. To transfer heat from the Earth's surface to the atmosphere
Correct B. To transport water from the oceans to the atmosphere
C. To regulate Earth's temperature and climate
D. To produce precipitation and weather patterns

Correct Answer: B

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Question 25
In the context of nutrition, what is the primary function of chlorophyll?
Correct A. To absorb light energy from the sun
B. To synthesize glu\cose from CO2 and H2O
C. To regulate plant growth and development
D. To produce flowers and fruits

Correct Answer: A

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