Practice post utme skyline university biology 2021 Past Questions

Question 1

In a eukaryotic cell, the \endoplasmic reticulum is involved in the synthesis of proteins that are destined for secretion or for use within the cell. Which of the following statements is true about the \endoplasmic reticulum?

A. The \endoplasmic reticulum is a type of organelle found in prokaryotic cells.

B. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for use within the cell.

C. The \endoplasmic reticulum is a type of organelle found in eukaryotic cells.

Correct D. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for secretion.

Correct Answer: D

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Question 2

A population of bacteria is growing in a controlled environment. The population size is measured at regular intervals, and the results are plotted on a graph. Which of the following types of growth is most likely to be observed?

Correct A. Exponential growth

B. Logarithmic growth

C. Linear growth

D. Sigmoidal growth

Correct Answer: A

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Question 3

A genetic engineer is working with a gene that codes for a protein involved in the breakdown of a particular compound. The gene is inserted into a plasmid, and the plasmid is then introduced into a bacterium. Which of the following statements is true about the gene and the plasmid?

A. The gene is inserted into the plasmid u\sing a restriction enzyme.

Correct B. The gene is inserted into the plasmid u\sing a ligase.

C. The gene is inserted into the plasmid u\sing a PCR machine.

D. The gene is inserted into the plasmid u\sing a DNA sequencer.

Correct Answer: B

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Question 4

A researcher is studying the effects of a particular environmental factor on the growth of a plant. The researcher measures the growth of the plant over a period of time and plots the results on a graph. Which of the following types of growth is most likely to be observed?

A. Exponential growth

B. Logarithmic growth

Correct C. Linear growth

D. Sigmoidal growth

Correct Answer: C

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Question 5

A geneticist is studying the inheri\tance of a particular trait in a population of organisms. The geneticist uses a Punnett square to predict the probability of the trait being expressed in the offspring. Which of the following statements is true about the Punnett square?

Correct A. The Punnett square is used to predict the probability of a trait being expressed in the offspring.

B. The Punnett square is used to predict the probability of a trait being recessive.

C. The Punnett square is used to predict the probability of a trait being dominant.

D. The Punnett square is used to predict the probability of a trait being expressed in the parents.

Correct Answer: A

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Question 6

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

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Question 7

A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?

A. 1/4

Correct B. 1/2

C. 3/4

D. 3/8

Correct Answer: B

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Question 8

A researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the carrying capacity K is 1000 and the initial population is 100, what is the population size after 10 years?

A. 500

B. 750

C. 900

Correct D. 950

Correct Answer: D

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Question 9

A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?

A. 1/4

Correct B. 1/2

C. 3/4

D. 3/8

Correct Answer: B

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Question 10

A researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the carrying capacity K is 1000 and the initial population is 100, what is the population size after 10 years?

A. 500

B. 750

C. 900

Correct D. 950

Correct Answer: D

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Question 11

In the context of human eco\logy, what is the primary function of the hypothalamus in regulating body temperature?

A. To maintain a cons\tant body temperature through sweating and shivering.

Correct B. To regulate body temperature through the release of hormones.

C. To maintain a stable body temperature through the use of insulation.

D. To regulate body temperature through the use of vasodilation and vasoconstriction.

Correct Answer: B

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Question 12

A researcher is studying the effects of light intensity on plant growth. Which of the following types of eco\logical study would be most appropriate?

Correct A. Experimental study

B. Correlational study

C. Descriptive study

D. Comparative study

Correct Answer: A

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Question 13

A diagram of the human eye is shown below. What is the primary function of the optic nerve?

Correct A. To transmit visual information from the retina to the brain.

B. To regulate the amount of light entering the eye.

C. To focus light onto the retina.

D. To protect the eye from injury.

Correct Answer: A

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Question 14

A researcher is studying the effects of pH on enzyme activity. Which of the following types of eco\logical study would be most appropriate?

Correct A. Experimental study

B. Correlational study

C. Descriptive study

D. Comparative study

Correct Answer: A

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Question 15

A diagram of the human respiratory system is shown below. What is the primary function of the diaphragm?

Correct A. To expand and contract the lungs during breathing.

B. To regulate the amount of air entering the lungs.

C. To protect the lungs from injury.

D. To maintain a cons\tant body temperature.

Correct Answer: A

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Question 16

In a population of 1000 individuals, 200 are infected with a particular disease. If the disease is caused by a bacterium that has a 50% transmission rate, what is the expected number of new infections after 5 generations?

A. 10

B. 20

C. 50

Correct D. 100

Correct Answer: D

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Question 17

A plant has a root system with a total surface area of 100 cm². If the root system is divided into two equal parts, what is the surface area of each part?

Correct A. 50

B. 75

C. 100

D. 150

Correct Answer: A

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Question 18

A cell has a volume of 1000 μm³. If the cell is divided into two equal parts, what is the volume of each part?

Correct A. 500

B. 750

C. 1000

D. 1500

Correct Answer: A

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Question 19

A population of 1000 individuals has a 50% mortality rate. If the population is divided into two equal parts, what is the expected number of individuals in each part?

Correct A. 500

B. 750

C. 1000

D. 1500

Correct Answer: A

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Question 20

A plant has a root system with a total surface area of 100 cm². If the root system is divided into three equal parts, what is the surface area of each part?

A. 33

B. 50

Correct C. 66

D. 100

Correct Answer: C

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Question 21

In a tropical rainforest, the primary consumers are primarily composed of what type of organisms?

Correct A. Herbivores

B. Carnivores

C. Decomposers

D. Omnivores

Correct Answer: A

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Question 22

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

Correct A. Photosynthesis

B. Respiration

C. Transpiration

D. Evaporation

Correct Answer: A

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Question 23

In a desert e\cosystem, what type of organisms are typically found in the topmost layer of the soil?

Correct A. Bacteria

B. Fungi

C. Algae

D. Lichens

Correct Answer: A

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Question 24

The process by which water moves through a plant, from the roots to the leaves, is known as?

Correct A. Transpiration

B. Respiration

C. Photosynthesis

D. Osmosis

Correct Answer: A

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Question 25

The type of tissue found in the human brain that is responsible for transmitting nerve impulses is known as?

Correct A. Nervous tissue

B. Muscular tissue

C. Epithelial tissue

D. Connective tissue

Correct Answer: A

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