Practice Post UTME LEAD CITY UNIVERSITY biology 2019 Past Questions

Question 1

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' for red eyes 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 2

A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?

A. Trachea

Correct B. Lungs

C. Diaphragm

D. Bronchi

Correct Answer: B

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Question 3

The diagram below shows the structure of a plant cell. Which of the following organelles is responsible for protein synthesis?

A. Mitochondrion

B. Plastid

Correct C. Ribosome

D. Nucleus

Correct Answer: C

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Question 4

A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 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 5

The diagram below shows the structure of a neuron. Which of the following parts of the neuron is responsible for transmitting signals to other neurons?

A. D\endrite

Correct B. Axon

C. Cell Body

D. Myelin Sheath

Correct Answer: B

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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'?

A. 0.36

Correct B. 0.64

C. 0.72

D. 0.80

Correct Answer: B

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Question 7

The diagram below shows the structure of a plant cell. Which part is responsible for photosynthesis?

A. Vacuole

Correct B. Chloroplast

C. Cell Wall

D. Cytoplasm

Correct Answer: B

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Question 8

A 2.5-liter solution contains 1.8 liters of ethanol and 0.7 liters of water. What is the mole \fraction of ethanol?

A. 0.64

Correct B. 0.72

C. 0.80

D. 0.88

Correct Answer: B

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Question 9

The diagram below shows a cross-section of a human kidney. Which part is responsible for filtering waste from the blood?

Correct A. Nephron

B. Renal Artery

C. Renal Vein

D. Kidney Cortex

Correct Answer: A

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Question 10

A 5-kg block is attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is its maximum kinetic energy?

A. 0.4

B. 0.6

Correct C. 0.8

D. 1.0

Correct Answer: C

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Question 11

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. 0.36

Correct B. 0.64

C. 0.8

D. 0.16

Correct Answer: B

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Question 12

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?

A. 2.0 \times 10^5 Pa

Correct B. 3.0 \times 10^5 Pa

C. 4.0 \times 10^5 Pa

D. 5.0 \times 10^5 Pa

Correct Answer: B

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Question 13

A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the concentration of CO2 is 400 ppm, what is the rate of photosynthesis?

A. 2.0 \times 10^{-3} mol CO2 s-1

Correct B. 4.0 \times 10^{-3} mol CO2 s-1

C. 6.0 \times 10^{-3} mol CO2 s-1

D. 8.0 \times 10^{-3} mol CO2 s-1

Correct Answer: B

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Question 14

A 0.5 L solution contains 0.2 mol of glu\cose. What is the concentration of glu\cose?

A. 0.2 M

B. 0.3 M

Correct C. 0.4 M

D. 0.5 M

Correct Answer: C

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Question 15

A 1.0 L solution contains 0.5 mol of NaCl. What is the concentration of NaCl?

A. 0.2 M

B. 0.3 M

C. 0.4 M

Correct D. 0.5 M

Correct Answer: D

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Question 16

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?

Correct A. Oxygen

B. Carbon dioxide

C. Water

D. Nitrogen

Correct Answer: A

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Question 17

In the context of cellular respiration, what is the role of the mitochondria?

A. Site of protein synthesis

Correct B. Site of cellular respiration

C. Site of cell division

D. Site of cell signaling

Correct Answer: B

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Question 18

The process of mitosis is a type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell. Which of the following stages of mitosis is characterized by the separation of sister chromatids?

A. Prophase

B. Metaphase

Correct C. Anaphase

D. Telophase

Correct Answer: C

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Question 19

The process of digestion in the human body involves the breakdown of large molecules 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 amino acids?

A. Amylase

B. Lipase

Correct C. Tryp\sin

D. Lactase

Correct Answer: C

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Question 20

The process of evolution by natural selection involves the survival and reproduction of individuals with favorable traits in a given environment. Which of the following is a key component of this process?

A. Mutation

B. Genetic drift

C. Gene flow

Correct D. Natural selection

Correct Answer: D

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Question 21

The process of hormonal coordination involves the release of hormones from the hypothalamus, which then stimulate the release of other hormones from the pituitary gland. What is the primary function of the hypothalamus in this process?

A. To regulate body temperature

Correct B. To stimulate the release of other hormones

C. To control appetite and thirst

D. To regulate sleep and wakefulness

Correct Answer: B

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Question 22

The xylem in plants is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this transport occurs?

A. Through the process of osmosis

B. Through the process of diffusion

Correct C. Through the process of transpiration

D. Through the process of active transport

Correct Answer: C

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Question 23

The sense organ responsible for detecting changes in light intensity is the?

Correct A. Eye

B. Ear

C. Nose

D. Mouth

Correct Answer: A

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Question 24

The process of cell division that results in the production of four daughter cells is?

Correct A. Mitosis

B. Meiosis

C. Binary fission

D. Endoreduplication

Correct Answer: A

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Question 25

The hormone responsible for regulating blood sugar levels is?

Correct A. Insulin

B. Glucagon

C. Adrenaline

D. Thyroxine

Correct Answer: A

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