POST UTME LASU 2017 Biology | Objective

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Question 1 View Details
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2
Correct C. To pump protons across the mitochondrial membrane
D. To reduce oxygen to water

Correct Answer: C

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Question 2 View Details
A plant's xylem is responsible for transporting what subs\tance from the roots to the leaves?
Correct A. Water and minerals
B. Sugars and amino acids
C. Hormones and vitamins
D. Gases and ions

Correct Answer: A

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Question 3 View Details
The process of mitosis results in what type of cell division?
A. Meiosis
Correct B. Mitosis
C. Binary fission
D. Endoreduplication

Correct Answer: B

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Question 4 View Details
The human eye has what type of photoreceptor cells that are sensitive to light intensity?
A. Bipolar cells
B. Ganglion cells
Correct C. Rod cells
D. Cones cells

Correct Answer: C

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Question 5 View Details
The process of diffusion occurs when particles move from an area of high concentration to an area of low concentration, resulting in what type of equilibrium?
Correct A. Dynamic equilibrium
B. Static equilibrium
C. Thermodynamic equilibrium
D. Chemical equilibrium

Correct Answer: A

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Question 6 View Details
In a typical xylem vessel, what is the primary function of the lignin component?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To protect the vessel from pathogens

Correct Answer: A

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Question 7 View Details
A cell undergoing mitosis has a nucleus with 4 pairs of sister chromatids. How many chromosomes will be present in each daughter cell after mitosis?
A. 8
Correct B. 16
C. 32
D. 64

Correct Answer: B

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Question 8 View Details
A plant has a photosynthetic rate of 10 μmol CO2 m-2 s-1. If the plant is exposed to light for 8 hours, how much CO2 will be fixed?
A. 80 μmol
B. 160 μmol
C. 320 μmol
Correct D. 640 μmol

Correct Answer: D

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Question 9 View Details
A 2-year-old child has a hemoglobin level of 10 g/dL. What is the percentage of the child's expected hemoglobin level?
A. 50%
Correct B. 60%
C. 70%
D. 80%

Correct Answer: B

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Question 10 View Details
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 11 View Details
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 dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 12 View Details
A 2-year-old child is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid phenylalanine. Which of the following enzymes is deficient in this disorder?
Correct A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase

Correct Answer: A

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Question 13 View Details
A diagram of the human eye is shown below. What is the function of the part labeled 'C'?
A. To focus light on the retina
Correct B. To regulate the amount of light entering the eye
C. To produce tears
D. To detect movement

Correct Answer: B

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Question 14 View Details
A 5-year-old child is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid tyro\sine. Which of the following enzymes is deficient in this disorder?
A. Phenylalanine hydroxylase
Correct B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase

Correct Answer: B

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Question 15 View Details
A diagram of the human brain is shown below. What is the function of the part labeled 'D'?
A. To control movement
B. To regulate body temperature
C. To control breathing
Correct D. To regulate hunger and thirst

Correct Answer: D

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Question 16 View Details
In the context of the classification of living things, which of the following is an example of a characteristic that distinguishes between prokaryotic and eukaryotic cells?
Correct A. Presence of a true nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of ribosomes

Correct Answer: A

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Question 17 View Details
A diagram of the human eye is shown below. Which of the following statements is true regarding the structure of the eye?
A. The cornea is the transparent part of the eye
B. The iris is the colored part of the eye
Correct C. The lens is the part of the eye that changes shape to focus light
D. The retina is the part of the eye that detects light

Correct Answer: C

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Question 18 View Details
In the context of respiration and gas exchange, which of the following is an example of a process that occurs in the lungs?
A. Photosynthesis
Correct B. Respiration
C. Transpiration
D. Evaporation

Correct Answer: B

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Question 19 View Details
A diagram of the human reproductive system is shown below. Which of the following statements is true regarding the structure of the male reproductive system?
Correct A. The testes are the organs that produce sperm
B. The epididymis is the tube that stores sperm
C. The vas deferens is the tube that carries sperm from the testes to the penis
D. The prostate gland is the gland that produces semen

Correct Answer: A

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Question 20 View Details
In the context of classification of living things, which of the following is an example of a characteristic that distinguishes between plants and animals?
A. Presence of a cell wall
Correct B. Presence of chloroplasts
C. Presence of a true nucleus
D. Presence of mitochondria

Correct Answer: B

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Question 21 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. What is the probability that two offspring 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 22 View Details
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will be tall?
A. 0.5
Correct B. 0.75
C. 0.25
D. 0.33

Correct Answer: B

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Question 23 View Details
A cell is placed in a solution with a pH of 5.5. What is the concentration of hydrogen ions in this solution?
Correct A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M

Correct Answer: A

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Question 24 View Details
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1600
B. 3200
Correct C. 6400
D. 12800

Correct Answer: C

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Question 25 View Details
A plant is placed in a greenhouse with a temperature of 25°C. What is the rate of respiration of this plant?
A. 2.0 x 10^-5 mol CO2/min
Correct B. 2.0 x 10^-6 mol CO2/min
C. 2.0 x 10^-7 mol CO2/min
D. 2.0 x 10^-8 mol CO2/min

Correct Answer: B

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