Practice post utme al-hikmah university biology 2017 Past Questions

Question 1

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

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Question 2

A 50-year-old patient presents with symptoms of chronic kidney disease. Which of the following is a primary function of the kidneys that is affected in this condition?

A. Regulation of blood pressure

B. Maintenance of electrolyte balance

Correct C. Removal of waste products

D. Production of red blood cells

Correct Answer: C

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Question 3

A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following is a characteristic of the enzyme that would be affected by changes in pH?

A. Optimum temperature

Correct B. pH optimum

C. Substrate specificity

D. Catalytic rate

Correct Answer: B

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Question 4

A 30-year-old woman presents with symptoms of iron deficiency anemia. Which of the following is a primary function of the liver that is affected in this condition?

A. Production of bile

B. Storage of glycogen

C. Synthesis of cholesterol

Correct D. Storage of iron

Correct Answer: D

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Question 5

A researcher is studying the effect of light on the growth of radish plants. Which of the following is a characteristic of the plants that would be affected by changes in light intensity?

Correct A. Rate of photosynthesis

B. Rate of respiration

C. Rate of transpiration

D. Rate of germination

Correct Answer: A

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Question 6

In the context of respiration, what is the primary function of the mitochondria in the process of cellular respiration?

Correct A. To generate ATP through the citric acid cycle

B. To produce NADH and FADH2 through glycolysis

C. To synthesize glu\cose from CO2 and H2O

D. To break down glu\cose into pyruvate through glycolysis

Correct Answer: A

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Question 7

A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?

Correct A. To transport water and minerals from the roots to the leaves

B. To transport sugars and other organic compounds from the leaves to the rest of the plant

C. To provide structural support to the plant

D. To regulate the plant's water balance

Correct Answer: A

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Question 8

In the context of excretion, what is the primary function of the kidneys in the human body?

A. To regulate the body's pH levels

Correct B. To produce urine and remove waste products from the body

C. To regulate the body's water balance

D. To produce hormones that regulate various bodily functions

Correct Answer: B

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Question 9

A diagram of the genetic code is shown below. What is the primary function of the genetic code?

A. To store genetic information in the form of DNA

Correct B. To translate genetic information into proteins

C. To regulate gene expression

D. To repair damaged DNA

Correct Answer: B

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Question 10

In the context of evolutionary theory, what is the primary mechanism of speciation?

A. Mutation

B. Genetic drift

C. Gene flow

Correct D. Natural selection

Correct Answer: D

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Question 11

In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?

A. Gene flow

B. Mutation

Correct C. Genetic drift

D. Natural selection

Correct Answer: C

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Question 12

A cell undergoing mitosis has a total of 46 chromosomes. How many chromosomes will each daughter cell have after mitosis?

Correct A. 23

B. 46

C. 92

D. 184

Correct Answer: A

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Question 13

A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?

Correct A. Photosynthesis

B. Respiration

C. Transpiration

D. Osmosis

Correct Answer: A

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Question 14

A population of rabbits is growing at a rate of 20% per year. If the population is currently 1000 rabbits, what will be the population after 5 years?

A. 1630

B. 2000

C. 2500

Correct D. 3000

Correct Answer: D

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Question 15

A diagram of a DNA molecule is shown below. What is the function of the structure labeled 'B'?

A. Replication

Correct B. Transcription

C. Translation

D. Mutation

Correct Answer: B

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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. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 17

A nerve impulse travels down a neuron at a speed of 120 m/s. If the impulse is 2.5 cm long, how long does it take to travel the length of the impulse?

Correct A. 0.02 s

B. 0.05 s

C. 0.1 s

D. 0.2 s

Correct Answer: A

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Question 18

A cell has a membrane potential of -70 mV. If the cell is stimulated to fire an action potential, what is the maximum rate of change of the membrane potential?

A. 10 mV/ms

B. 20 mV/ms

C. 30 mV/ms

Correct D. 40 mV/ms

Correct Answer: D

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Question 19

A population of rabbits is growing \logistically with a carrying capacity of 1000 individuals. If the initial population size is 100 individuals, what is the population size after 5 years?

A. 500

B. 750

C. 900

Correct D. 1000

Correct Answer: D

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Question 20

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

Correct A. Mitochondria

B. Nucleus

C. Cell wall

D. Plastid

Correct Answer: A

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Question 21

In the context of xylem transport, what is the primary function of the xylem parenchyma cells?

Correct A. To store and transport water and minerals

B. To produce and store food for the plant

C. To provide structural support to the plant

D. To regulate the rate of transpiration

Correct Answer: A

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Question 22

A population of rabbits is growing at a rate of 20% per year. If the current population is 1000, what will be the population after 5 years?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 23

In a cell undergoing mitosis, what is the stage where the chromosomes are most condensed?

A. Prophase

Correct B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: B

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Question 24

A plant is placed in a solution with a high concentration of salt. What will happen to the plant's cells?

A. The cells will shrink due to water loss

B. The cells will swell due to water uptake

C. The cells will remain unchanged

Correct D. The cells will burst due to osmotic pressure

Correct Answer: D

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Question 25

In the context of excretion, what is the primary function of the kidneys?

Correct A. To filter waste products from the blood

B. To regulate the amount of water in the body

C. To produce hormones that control growth and development

D. To produce digestive enzymes

Correct Answer: A

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