POST UTME REDEEMERS UNIVERSITY 2022 Biology | Objective

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Question 1 View Details
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the Δπγαλλενγ παπτερσ \( anaphase-promoting complex \). What is the primary function of the Δπγαλλενγ παπτερσ in this process?
Correct A. To degrade the cohe\sin proteins holding sister chromatids together
B. To activate the kinetochore proteins that attach to microtubules
C. To phosphorylate the histone proteins that condense chromatin
D. To recruit the spindle checkpoint proteins that monitor chromosome alignment

Correct Answer: A

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Question 2 View Details
A species of bird has a beak shape that is well-suited for cracking open nuts. However, this beak shape also makes it difficult for the bird to eat seeds. What type of natural selection is occurring in this population?
Correct A. Directional selection
B. Stabilizing selection
C. Disruptive selection
D. Balancing selection

Correct Answer: A

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Question 3 View Details
A geneticist is studying a population of fruit flies and wants to determine the frequency of a particular allele. She collects 100 flies and finds that 60 of them have the allele. What is the frequency of the allele in this population?
Correct A. 0.6
B. 0.4
C. 0.2
D. 0.1

Correct Answer: A

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Question 4 View Details
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins
Correct B. To store genetic information
C. To regulate gene expression
D. To transport materials across the cell membrane

Correct Answer: B

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Question 5 View Details
A diagram of a human eye is shown below. What is the function of the structure labeled 'B'?
A. To focus light on the retina
Correct B. To detect changes in light intensity
C. To regulate the amount of light entering the eye
D. To transmit visual signals to the brain

Correct Answer: B

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Question 6 View Details
In a population of E. coli, the frequency of the gene for resis\tance to ampicillin is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many are expected to be resis\tant?
A. 100
Correct B. 200
C. 400
D. 600

Correct Answer: B

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Question 7 View Details
A plant with the genotype AaBb produces 50% A and 50% a offspring. What is the genotype of the parent plant?
A. AABB
Correct B. AAbb
C. AaBB
D. Aabb

Correct Answer: B

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Question 8 View Details
A diagram of the human respiratory system is shown below. Which part 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 9 View Details
A diagram of the human digestive system is shown below. Which part is responsible for the breakdown of proteins?
A. Mouth
Correct B. Stomach
C. Small intestine
D. Large intestine

Correct Answer: B

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Question 10 View Details
A diagram of the human respiratory system is shown below. Which part 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 11 View Details
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To produce xylem sap
Correct B. To store water and minerals
C. To transport xylem sap
D. To regulate xylem sap flow

Correct Answer: B

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Question 12 View Details
A patient is diagnosed with a bacterial infection. Which of the following microorganisms is most likely responsible for the infection?
A. Escherichia coli
Correct B. Staphylococcus aureus
C. Pseudomonas aeruginosa
D. Klebsiella pneumoniae

Correct Answer: B

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Question 13 View Details
A diagram of a plant cell is shown below. What is the function of the cell wall?
Correct A. To provide structural support
B. To regulate cell growth
C. To transport subs\tances
D. To synthesize proteins

Correct Answer: A

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Question 14 View Details
A diagram of a human digestive system is shown below. What is the primary function of the small intestine?
Correct A. To absorb nutrients
B. To store waste
C. To regulate pH
D. To synthesize hormones

Correct Answer: A

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Question 15 View Details
A diagram of a human heart is shown below. What is the primary function of the atria?
Correct A. To pump blood to the lungs
B. To pump blood to the body
C. To regulate blood pressure
D. To synthesize hormones

Correct Answer: A

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Question 16 View Details
A diagram of a human kidney is shown below. What is the primary function of the nephrons?
Correct A. To filter waste from the blood
B. To regulate blood pressure
C. To synthesize hormones
D. To regulate pH

Correct Answer: A

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Question 17 View Details
A diagram of a human brain is shown below. What is the primary function of the cerebrum?
A. To regulate movement
B. To regulate sensation
C. To regulate emotion
Correct D. To regulate thought

Correct Answer: D

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Question 18 View Details
A diagram of a human eye is shown below. What is the primary function of the retina?
A. To regulate light
B. To regulate color
C. To regulate movement
D. To regulate thought

Correct Answer: VIEW ANSWER

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Question 19 View Details
The diagram below shows a cross-section of the human eye. 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 20 View Details
A population of bacteria is growing exponentially. If the initial population is 100 and the growth rate is 25% per hour, what will be the population after 3 hours?
A. 225
B. 250
C. 275
Correct D. 300

Correct Answer: D

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Question 21 View Details
The diagram below shows a pedigree chart of a family with a genetic disorder. What is the probability that a child of the couple will inherit the disorder?
A. 0%
B. 25%
Correct C. 50%
D. 75%

Correct Answer: C

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Question 22 View Details
The process of meiosis results in the production of which of the following?
A. Haploid cells
B. Diploid cells
C. Gametes
Correct D. Sperm and egg cells

Correct Answer: D

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Question 23 View Details
The diagram below shows a cross-section of a plant root. Which part of the root is responsible for absorbing water and minerals from the soil?
A. Cortex
B. Stele
Correct C. Xylem
D. Phloem

Correct Answer: C

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Question 24 View Details
The process of osmoregulation in animals involves the regulation of which of the following?
A. Water balance
B. Electrolyte balance
C. pH balance
Correct D. All of the above

Correct Answer: D

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Question 25 View Details
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. Cortex
B. Medulla
C. Renal pelvis
D. Collecting duct

Correct Answer: A

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