Practice Post UTME CHRISTOPHER UNIVERSITY biology 2017 Past Questions

Question 1 View Details

In a photosynthetic pathway, which of the following is the primary electron acceptor in the reaction center?

A. P700

Correct B. P680

C. Pheophytin

D. Plastocyanin

Correct Answer: B

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Question 2 View Details

A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following would be the most appropriate way to express the relationship between pH and enzyme activity?

Correct A. pH = -\log10[Enzyme Activity]

B. Enzyme Activity = 10^\( -pH \)

C. pH = \log10[Enzyme Activity]

D. Enzyme Activity = 10^(pH)

Correct Answer: A

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Question 3 View Details

A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?

A. Mitochondria

B. Chloroplast

C. Vacuole

Correct D. Nucleus

Correct Answer: D

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Question 4 View Details

A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what is the population size after 5 hours?

Correct A. 100(1.05)^5

B. 100(1.05)^10

C. 100(1.05)^15

D. 100(1.05)^20

Correct Answer: A

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Question 5 View Details

A geneticist is studying the inheri\tance of a particular trait in a family. Which of the following types of inheri\tance would be most likely to result in a pattern of inheri\tance where the trait is expressed in every generation?

Correct A. Autosomal Dominant

B. Autosomal Recessive

C. X-linked Dominant

D. X-linked Recessive

Correct Answer: A

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Question 6 View Details

In a typical mammalian kidney, which of the following structures is primarily responsible for the reabsorption of glu\cose from the filtrate?

Correct A. Proximal convoluted tubule

B. Distal convoluted tubule

C. Loop of Henle

D. Collecting duct

Correct Answer: A

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Question 7 View Details

A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?

A. Trachea

B. Bronchi

Correct C. Lungs

D. Diaphragm

Correct Answer: C

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Question 8 View Details

The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?

Correct A. Root hair

B. Cortex

C. Stele

D. Xylem

Correct Answer: A

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Question 9 View Details

In the classification of living things, which of the following kingdoms is characterized by the presence of cell walls made of cellulose?

A. Animalia

Correct B. Plantae

C. Fungi

D. Protista

Correct Answer: B

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Question 10 View Details

A diagram of the human excretory system is shown below. Which of the following structures is responsible for the filtration of blood?

Correct A. Kidney

B. Ureter

C. Bladder

D. Urethra

Correct Answer: A

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Question 11 View Details

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'?

A. 0.36

Correct B. 0.64

C. 0.72

D. 0.84

Correct Answer: B

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Question 12 View Details

A 10-kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is its angular frequency?

A. 1.58 rad/s

B. 2.00 rad/s

Correct C. 2.83 rad/s

D. 3.16 rad/s

Correct Answer: C

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Question 13 View Details

A plant grows in a pot with a mixture of soil and sand. The plant's roots absorb water and nutrients from the soil. Which of the following is a characteristic of the plant's roots?

A. They are adapted for gas exchange.

Correct B. They are adapted for water and nutrient absorption.

C. They are adapted for support.

D. They are adapted for reproduction.

Correct Answer: B

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Question 14 View Details

A 2.0-L sample of a gas at 25°C and 1.0 atm is compressed to 0.5 L. What is the new pressure of the gas?

A. 2.0 atm

B. 4.0 atm

Correct C. 6.0 atm

D. 8.0 atm

Correct Answer: C

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Question 15 View Details

A population of bacteria grows according to the equation N(t) = N_0 e^(kt), where N(t) is the population at time t, N_0 is the initial population, and k is the growth rate. If the population doubles in 2 hours, what is the growth rate?

A. 0.10 h^\( -1 \)

Correct B. 0.20 h^\( -1 \)

C. 0.30 h^\( -1 \)

D. 0.40 h^\( -1 \)

Correct Answer: B

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Question 16 View Details

A 20-year-old male patient presents with a 2-year history of progressive weakness of the proximal muscles of the lower limbs. On examination, the patient has a characteristic 'pseudohypertrophy' of the muscles of the lower limbs. Which of the following is the most likely diagnosis?

Correct A. Duchenne Muscular Dystrophy

B. Becker Muscular Dystrophy

C. Myotonic Dystrophy

D. Spinal Muscular Atrophy

Correct Answer: A

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Question 17 View Details

A 35-year-old woman presents with a 5-year history of recurrent episodes of fever, chills, and flank pain. Urinalysis shows the presence of blood and protein. Which of the following is the most likely diagnosis?

A. Pyelonephritis

B. Nephrolithiasis

C. Glomerulonephritis

Correct D. Polycystic Kidney Disease

Correct Answer: D

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Question 18 View Details

A 25-year-old man presents with a 2-year history of progressive shortness of breath and fatigue. On examination, the patient has a characteristic 'clubbing' of the fingers. Which of the following is the most likely diagnosis?

Correct A. Cystic Fibrosis

B. Chronic Obstructive Pulmonary Disease (COPD)

C. Pulmonary Embolism

D. Lung Cancer

Correct Answer: A

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Question 19 View Details

A 30-year-old woman presents with a 3-year history of recurrent episodes of abdominal pain, diarrhea, and weight loss. On examination, the patient has a characteristic 'cobblestone' appearance of the colon. Which of the following is the most likely diagnosis?

A. Ulcerative Colitis

Correct B. Crohn's Disease

C. Irritable Bowel Syndrome (IBS)

D. Gastroesophageal Reflux Disease (GERD)

Correct Answer: B

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Question 20 View Details

A 40-year-old man presents with a 5-year history of progressive shortness of breath and fatigue. On examination, the patient has a characteristic 'jugular venous distension'. Which of the following is the most likely diagnosis?

Correct A. Congestive Heart Failure

B. Cor Pulmonale

C. Pulmonary Embolism

D. Cardiac Tamponade

Correct Answer: A

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Question 21 View Details

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 recessive genotype 'aa'?

Correct A. 0.04

B. 0.16

C. 0.24

D. 0.36

Correct Answer: A

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Question 22 View Details

A 5% solution of glu\cose in water has a density of 1.05 g/mL. If 250 mL of this solution is diluted to 1 L, what is the concentration of glu\cose in the final solution?

A. 0.5%

Correct B. 1%

C. 1.5%

D. 2%

Correct Answer: B

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Question 23 View Details

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 1

Correct Answer: B

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Question 24 View Details

A 2.0 L flask contains 1.0 mol of an ideal gas at 298 K. If the gas is allowed to expand to 4.0 L at cons\tant temperature, what is the new pressure?

A. 0.25 atm

Correct B. 0.5 atm

C. 0.75 atm

D. 1 atm

Correct Answer: B

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Question 25 View Details

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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