Practice Post UTME SUMMIT UNIVERSITY biology 2020 Past Questions

Question 1

In a population of E. coli, the frequency of the dominant allele 'B' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype?

A. 0.16

B. 0.64

C. 0.36

D. 0.04

Question 2

A plant has a genotype of RrSs for the flower color gene. What is the probability that a plant with this genotype will produce a red flower?

A. 0.5

B. 0.75

C. 0.25

D. 0.33

Question 3

The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins into peptides?

A. Pep\sin

B. Tryp\sin

C. Lactase

D. Amylase

Question 4

A person has a blood type of AB positive. What is the genotype of this individual?

A. IAi

B. IBi

C. IAIB

D. IAiIB

Question 5

The growth and development of living organisms is influenced by various factors, including genetics, environment, and nutrition. Which of the following is a key factor that influences the growth rate of plants?

A. Light intensity

B. Temperature

C. Water availability

D. Soil pH

Question 6

A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is the maximum speed of the block?

A. 2

B. 4

C. 6

D. 8

Question 7

A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 0.01 cm/s, what is the rate of diffusion of H+ ions into the cell?

A. 0.01

B. 0.1

C. 1

D. 10

Question 8

A patient is diagnosed with a kidney disease that affects the excretion of waste products. Which of the following is a likely consequence of this disease?

A. Increased blood pressure

B. Decreased blood pressure

C. Increased urine production

D. Decreased urine production

Question 9

In a population of 1000 organisms, 200 are heterozygous for a particular gene, 300 are homozygous dominant, and 500 are homozygous recessive. What is the frequency of the recessive allele?

A. 0.5

B. 0.4

C. 0.3

D. 0.2

Question 10

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. 0.16

B. 0.36

C. 0.64

D. 0.84

Question 11

A patient is diagnosed with a blood disorder that affects the production of red blood cells. Which of the following is a likely consequence of this disorder?

A. Increased hemoglobin levels

B. Decreased hemoglobin levels

C. Increased white blood cell count

D. Decreased platelet count

Question 12

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?

A. 0.36

B. 0.64

C. 0.16

D. 0.04

Question 13

The xylem and phloem tissues in a plant are responsible for transporting water and nutrients, respectively. What is the primary mechanism by which water is transported through the xylem?

A. Transpiration pull

B. Osmosis

C. Diffusion

D. Active transport

Question 14

The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?

A. Oxygen

B. Carbon dioxide

C. Water

D. Nitrogen

Question 15

In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?

A. Regulation of body temperature

B. Maintenance of blood glu\cose levels

C. Response to stress and anxiety

D. Regulation of appetite and satiety

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