Practice post utme christopher university biology 2018 Past Questions

Question 1

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

Correct A. Random mating

B. Genetic drift

C. Mutation

D. Gene flow

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2

In the context of the nervous system, what is the primary function of the axon hillock?

A. To synthesize neurotransmitters

Correct B. To transmit action potentials

C. To regulate ion channels

D. To produce myelin sheath

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3

The xylem is responsible for transporting water and minerals from the roots to the leaves of a plant. What is the primary mechanism by which water is transported through the xylem?

Correct A. Transpiration pull

B. Root pressure

C. Capillary action

D. Osmosis

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4

The diagram below shows a cross-section of a plant root. What is the function of the structure labeled 'A'?

Correct A. To absorb water and minerals

B. To store starch

C. To produce hormones

D. To support the root

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5

The diagram below shows a simple circuit. What is the function of the component labeled 'R'?

A. To generate voltage

Correct B. To reduce current

C. To increase resis\tance

D. To store energy

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 6

A patient with a rare genetic disorder has a mutation in the HBB gene, which codes for the \beta-globin subunit of hemoglobin. The mutation results in a substitution of glutamic acid for valine at position 6 of the \beta-globin protein. Which of the following is the most likely effect of this mutation on the structure and function of hemoglobin?

A. The mutation will result in a decrease in the affinity of hemoglobin for oxygen.

B. The mutation will result in a decrease in the cooperativity of hemoglobin.

C. The mutation will result in a decrease in the stability of hemoglobin.

Correct D. The mutation will result in a decrease in the ability of hemoglobin to bind to 2,3-bisphosphoglycerate.

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7

A researcher is studying the effects of a new antibiotic on the growth of E. coli bacteria. The researcher measures the growth of the bacteria in the presence and absence of the antibiotic and plots the results on a graph. Which of the following is the most likely effect of the antibiotic on the growth of the bacteria?

Correct A. The antibiotic will inhibit the growth of the bacteria.

B. The antibiotic will stimulate the growth of the bacteria.

C. The antibiotic will have no effect on the growth of the bacteria.

D. The antibiotic will increase the rate of growth of the bacteria.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8

A patient is diagnosed with a rare genetic disorder that affects the production of melanin. The patient's skin is pale and they have a high risk of skin cancer. Which of the following is the most likely cause of the patient's condition?

Correct A. A mutation in the TYR gene, which codes for the enzyme tyro\sinase.

B. A mutation in the SLC24A4 gene, which codes for the protein SLC24A4.

C. A mutation in the MC1R gene, which codes for the protein MC1R.

D. A mutation in the OCA2 gene, which codes for the protein OCA2.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9

A researcher is studying the effects of a new pesticide on the growth of plants. The researcher measures the growth of the plants in the presence and absence of the pesticide and plots the results on a graph. Which of the following is the most likely effect of the pesticide on the growth of the plants?

Correct A. The pesticide will inhibit the growth of the plants.

B. The pesticide will stimulate the growth of the plants.

C. The pesticide will have no effect on the growth of the plants.

D. The pesticide will increase the rate of growth of the plants.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 10

A patient is diagnosed with a rare genetic disorder that affects the production of melanin. The patient's skin is pale and they have a high risk of skin cancer. Which of the following is the most likely cause of the patient's condition?

Correct A. A mutation in the TYR gene, which codes for the enzyme tyro\sinase.

B. A mutation in the SLC24A4 gene, which codes for the protein SLC24A4.

C. A mutation in the MC1R gene, which codes for the protein MC1R.

D. A mutation in the OCA2 gene, which codes for the protein OCA2.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11

In a population of 1000 individuals, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12

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'?

Correct A. 0.5

B. 0.75

C. 0.25

D. 0.33

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 13

In a food chain, a producer is consumed by a primary consumer, which is then consumed by a secondary consumer. If the producer produces 100 units of energy, how much energy is transferred to the secondary consumer?

A. 50

Correct B. 75

C. 25

D. 100

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14

A population of bacteria is growing exponentially. If the initial population is 100 individuals and the population doubles every 2 hours, how many individuals will be present after 6 hours?

Correct A. 1600

B. 800

C. 400

D. 200

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 15

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16

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'?

Correct A. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17

A 2.5 cm long root hair cell is placed in a solution with a concentration of 0.1 M KCl. If the cell membrane is selectively permeable to K+ ions, what is the concentration of K+ ions inside the cell after 10 minutes?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18

A diagram of a plant cell is shown below. Identify the part labeled 'X'.

A. A

B. B

C. C

Correct D. D

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19

A 10 mL sample of a 0.5 M NaCl solution is diluted to 50 mL. What is the concentration of NaCl in the resulting solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20

A diagram of a human eye is shown below. Identify the part labeled 'Y'.

A. A

B. B

C. C

Correct D. D

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21

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'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22

A 2.5 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. What is the maximum speed of the block?

A. 0.5 m/s

Correct B. 1.0 m/s

C. 1.5 m/s

D. 2.0 m/s

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23

A bio\logist is studying the population dynamics of a species of rabbit. The population grows \logistically according to the equation dP/dt = rP\( 1 - P/K \), where P is the population size, r is the intrinsic growth rate, and K is the carrying capacity. If the initial population size is 100, the intrinsic growth rate is 0.2, and the carrying capacity is 1000, what is the population size after 5 years?

A. 500

B. 600

Correct C. 700

D. 800

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25

A 2.0 kg block is moving at a speed of 4.0 m/s on a frictionless surface. What is the kinetic energy of the block?

A. 8.0 J

B. 10.0 J

C. 12.0 J

Correct D. 16.0 J

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

POST UTME CHRISTOPHER UNIVERSITY 2018 Biology | Objective

Master the Exam!

Help others prepare! Share this practice hub: