Practice post utme summit university biology 2017 Past Questions

Question 1

A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2. What is the probability that two randomly selected flies will be homozygous recessive?

Correct A. 0.04

B. 0.08

C. 0.16

D. 0.32

Correct Answer: A

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Question 2

A researcher is studying the effect of a new pesticide on the growth of wheat. The pesticide is applied at a concentration of 10 mg/L. What is the concentration of the pesticide in the soil after 5 days of application, given that the half-life of the pesticide is 3 days?

Correct A. 1.25 mg/L

B. 2.5 mg/L

C. 5 mg/L

D. 10 mg/L

Correct Answer: A

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Question 3

A plant has a root system with a total surface area of 100 cm^2. The root system is composed of 5 roots, each with a surface area of 20 cm^2. What is the average surface area of each root?

A. 10 cm^2

B. 15 cm^2

Correct C. 20 cm^2

D. 25 cm^2

Correct Answer: C

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Question 4

A diagram of a plant's xylem is shown below. Identify the type of cell labeled 'A'.

Correct A. Tracheid

B. Xylem parenchyma

C. Xylem fiber

D. Xylem vessel

Correct Answer: A

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Question 5

A diagram of a plant's root system is shown below. Identify the type of root labeled 'B'.

Correct A. Taproot

B. Fibrous root

C. Adventitious root

D. Root hair

Correct Answer: A

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Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 7

A 2.5 g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 2.5 liters at 25°C and 1 atm. What is the empirical formula of the compound?

Correct A. CH4

B. C2H6

C. C3H8

D. C4H10

Correct Answer: A

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Question 8

A solution containing 0.1 M glu\cose and 0.2 M fructose is prepared. What is the total molarity of the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 9

A 50 mL sample of a 0.5 M NaOH solution is mixed with a 50 mL sample of a 0.5 M HCl solution. What is the pH of the resulting solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 10

A 2.5 g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 2.5 liters at 25°C and 1 atm. What is the empirical formula of the compound?

Correct A. CH4

B. C2H6

C. C3H8

D. C4H10

Correct Answer: A

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Question 11

In the context of hormonal coordination, what is the primary function of the hypothalamus?

A. Regulation of body temperature

B. Regulation of hunger and thirst

Correct C. Regulation of hormone secretion

D. Regulation of sleep and wakefulness

Correct Answer: C

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Question 12

Which of the following is an example of a tissue that is composed of multiple types of cells?

A. Epithelial tissue

B. Connective tissue

C. Muscle tissue

Correct D. Nervous tissue

Correct Answer: D

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Question 13

What is the process by which an organism's genetic information is passed from one generation to the next?

A. Mutation

B. Genetic drift

C. Natural selection

Correct D. Heredity

Correct Answer: D

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Question 14

In the context of growth and regulation, what is the term for the process by which an organism's cells divide and grow?

Correct A. Mitosis

B. Meiosis

C. Hormone regulation

D. Cell differentiation

Correct Answer: A

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Question 15

Which of the following is an example of a system that is composed of multiple organs that work together to perform a specific function?

A. Circulatory system

B. Nervous system

Correct C. Digestive system

D. Respiratory system

Correct Answer: C

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Question 16

The process of meiosis results in the production of four haploid cells from a diploid cell. Which of the following statements is true about the genetic variation in these four cells?

A. The four cells will have the same genotype and phenotype.

B. The four cells will have different genotypes but the same phenotype.

Correct C. The four cells will have different genotypes and phenotypes.

D. The four cells will have the same genotype but different phenotypes.

Correct Answer: C

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Question 17

A plant has a genotype of BB for the trait of flower color. What is the probability that a seed from this plant will have a genotype of bb?

A. 0%

Correct B. 25%

C. 50%

D. 100%

Correct Answer: B

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Question 18

The diagram below shows a cross between two pea plants.

A. The offspring will all be tall.

B. The offspring will all be short.

Correct C. The offspring will be a mix of tall and short.

D. The offspring will not be affected by the trait.

Correct Answer: C

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Question 19

The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following statements is true about the genetic variation in these two cells?

Correct A. The two cells will have the same genotype and phenotype.

B. The two cells will have different genotypes but the same phenotype.

C. The two cells will have different genotypes and phenotypes.

D. The two cells will have the same genotype but different phenotypes.

Correct Answer: A

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Question 20

A population of bacteria is growing exponentially. If the population size is currently 1000 and is increa\sing at a rate of 20% per hour, what will be the population size after 3 hours?

A. 1600

B. 2000

Correct C. 2500

D. 3000

Correct Answer: C

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Question 21

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

Correct A. Mutation

B. Gene flow

C. Genetic drift

D. Natural selection

Correct Answer: A

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Question 22

A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.

A. Nucleus

B. Mitochondria

Correct C. Ribosome

D. Lysosome

Correct Answer: C

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Question 23

A 25-year-old woman presents with a 2-year history of progressive weakness and fatigue. Her hemoglobin level is 8 g/dL. Which of the following is the most likely diagnosis?

Correct A. Iron deficiency anemia

B. Thalassemia major

C. Sickle cell disease

D. Pernicious anemia

Correct Answer: A

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Question 24

A diagram of a human eye is shown below. Identify the part responsible for detecting light.

A. Cornea

B. Iris

Correct C. Retina

D. Lens

Correct Answer: C

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Question 25

A 35-year-old man presents with a 5-year history of progressive shortness of breath. His chest X-ray shows a large mass in the right lung. Which of the following is the most likely diagnosis?

Correct A. Lung cancer

B. Tuberculosis

C. Pneumonia

D. Asthma

Correct Answer: A

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