Practice post utme pan-atlantic university biology 2024 Past Questions

Question 1

In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation within a population?

A. Genetic drift

B. Mutation

C. Gene flow

Correct D. Differential reproduction

Correct Answer: D

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Question 2

A diagram of the human respiratory system is shown below. Which of the following statements is true regarding the function of the alveoli?

Correct A. They are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream.

B. They are involved in the filtration of the blood.

C. They are a part of the digestive system.

D. They are responsible for the production of mucus.

Correct Answer: A

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Question 3

In the context of sense organs, what is the primary function of the cochlea in the human ear?

Correct A. To transmit sound vibrations to the brain.

B. To produce sound waves.

C. To filter out background noise.

D. To regulate body temperature.

Correct Answer: A

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Question 4

A diagram of the human circulatory system is shown below. Which of the following statements is true regarding the function of the coronary arteries?

Correct A. They supply oxygenated blood to the heart muscle.

B. They supply deoxygenated blood to the lungs.

C. They regulate body temperature.

D. They filter out waste products from the blood.

Correct Answer: A

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Question 5

In the context of evolutionary theory, what is the primary mechanism by which genetic variation is introduced into a population?

Correct A. Mutation

B. Genetic drift

C. Gene flow

D. Natural selection

Correct Answer: A

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Question 6

A study on the effects of hormonal coordination on reproductive behavior in rodents found that the administration of a specific hormone led to a significant increase in mating frequency. However, the study also found that the hormone had no effect on the number of offspring produced. Which of the following best explains this finding?

Correct A. The hormone affected the timing of mating but not the number of offspring produced.

B. The hormone had no effect on the reproductive behavior of the rodents.

C. The hormone increased the number of offspring produced but had no effect on mating frequency.

D. The hormone affected the number of offspring produced but had no effect on mating frequency.

Correct Answer: A

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Question 7

A population of Drosophila melanogaster was subjected to a genetic mutation that resulted in a change in the frequency of a specific allele. The mutation was found to be recessive and had no effect on the fitness of the individuals. However, the mutation did result in a change in the frequency of the allele in the population. What is the most likely explanation for this finding?

A. The mutation was a result of genetic drift.

B. The mutation was a result of natural selection.

C. The mutation was a result of gene flow.

Correct D. The mutation was a result of genetic mutation.

Correct Answer: D

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Question 8

A study on the sense organs of a specific species of fish found that the fish had a highly developed sense of smell. However, the study also found that the fish had a relatively poor sense of hearing. Which of the following best explains this finding?

A. The fish had a highly developed sense of smell because it was a predator.

B. The fish had a highly developed sense of smell because it was a prey species.

Correct C. The fish had a highly developed sense of smell because it lived in a turbid environment.

D. The fish had a highly developed sense of smell because it was a social species.

Correct Answer: C

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Question 9

A population of a specific species of plant was subjected to a genetic mutation that resulted in a change in the frequency of a specific allele. The mutation was found to be dominant and had a significant effect on the fitness of the individuals. However, the mutation did not result in a change in the frequency of the allele in the population. What is the most likely explanation for this finding?

A. The mutation was a result of genetic drift.

Correct B. The mutation was a result of natural selection.

C. The mutation was a result of gene flow.

D. The mutation was a result of genetic mutation.

Correct Answer: B

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Question 10

A study on the reproductive behavior of a specific species of animal found that the animals exhibited a form of asexual reproduction. However, the study also found that the animals had a complex social structure and were able to communicate with each other. Which of the following best explains this finding?

A. The animals exhibited a form of asexual reproduction because they were able to communicate with each other.

B. The animals exhibited a form of asexual reproduction because they had a complex social structure.

Correct C. The animals exhibited a form of asexual reproduction because they were able to reproduce quickly.

D. The animals exhibited a form of asexual reproduction because they were able to adapt to their environment.

Correct Answer: C

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Question 11

A study on the growth and regulation of a specific species of plant found that the plant had a highly developed root system. However, the study also found that the plant had a relatively poor ability to regulate its water content. Which of the following best explains this finding?

A. The plant had a highly developed root system because it was able to regulate its water content.

Correct B. The plant had a highly developed root system because it was able to absorb nutrients from the soil.

C. The plant had a highly developed root system because it was able to adapt to its environment.

D. The plant had a highly developed root system because it was a social species.

Correct Answer: B

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Question 12

A population of a specific species of animal was subjected to a genetic mutation that resulted in a change in the frequency of a specific allele. The mutation was found to be recessive and had no effect on the fitness of the individuals. However, the mutation did result in a change in the frequency of the allele in the population. What is the most likely explanation for this finding?

Correct A. The mutation was a result of genetic drift.

B. The mutation was a result of natural selection.

C. The mutation was a result of gene flow.

D. The mutation was a result of genetic mutation.

Correct Answer: A

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Question 13

In the context of growth and regulation, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?

A. Regulation of body temperature

Correct B. Maintenance of homeostasis

C. Stimulation of growth and development

D. Modulation of immune response

Correct Answer: B

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Question 14

A genetic disorder is caused by a mutation in the HFE gene. What type of mutation is most likely responsible for this disorder?

Correct A. Point mutation

B. Frameshift mutation

C. Deletion mutation

D. Insertion mutation

Correct Answer: A

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Question 15

A microorganism is isolated from a patient with a severe infection. The microorganism is identified as a Gram-positive, catalase-negative bacterium. What is the most likely cause of the infection?

A. Staphylococcus aureus

B. Streptococcus pneumoniae

Correct C. Enterococcus faecalis

D. Listeria monocytogenes

Correct Answer: C

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Question 16

A patient is diagnosed with a respiratory disease characterized by inflammation of the airways. Which of the following is a common symptom of this disease?

A. Coughing up blood

B. Shortness of breath

Correct C. Wheezing

D. Fatigue

Correct Answer: C

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Question 17

A genetic trait is inherited in an autosomal dominant pattern. What is the probability that a child will inherit the dominant allele from a parent who is heterozygous for the trait?

A. 25%

Correct B. 50%

C. 75%

D. 100%

Correct Answer: B

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Question 18

In a tropical rainforest e\cosystem, the primary producers are primarily composed of which of the following?

A. Grasses and shrubs

Correct B. Trees and vines

C. Mosses and ferns

D. Cacti and succulents

Correct Answer: B

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Question 19

The process by which plants convert light energy into chemical energy is known as?

A. Respiration

Correct B. Photosynthesis

C. Transpiration

D. Osmosis

Correct Answer: B

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Question 20

The human body has a total of how many bones in the adult skeleton?

A. 194

Correct B. 206

C. 216

D. 226

Correct Answer: B

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Question 21

The process by which the body regulates the amount of water in the body is known as?

A. Osmosis

B. Diffusion

C. Active transport

Correct D. Hormonal regulation

Correct Answer: D

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Question 22

The human eye has a total of how many muscles that control its movement?

A. 4

Correct B. 6

C. 8

D. 10

Correct Answer: B

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Question 23

In the context of cellular respiration, what is the primary function of the electron transport chain?

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2 from the citric acid cycle

Correct C. To pump protons across the mitochondrial inner membrane, creating a proton gradient

D. To reduce oxygen to water

Correct Answer: C

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Question 24

A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what will happen to the concentration of glu\cose inside the cell?

A. The concentration of glu\cose will increase

B. The concentration of glu\cose will decrease

Correct C. The concentration of glu\cose will remain the same

D. The cell will take up glu\cose through facilitated diffusion

Correct Answer: C

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Question 25

A diagram of a neuron is shown below. What is the function of the d\endrites?

A. To transmit signals away from the cell body

Correct B. To receive signals from other neurons

C. To synthesize neurotransmitters

D. To store genetic information

Correct Answer: B

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