POST UTME LEAD CITY UNIVERSITY 2023 Biology | Objective

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Question 1
In the context of photosynthesis, what is the role of the enzyme RuBisCO in the Calvin cycle?
Correct A. It catalyzes the conversion of CO2 into a 3-carbon molecule.
B. It is responsible for the light-dep\endent reactions.
C. It is involved in the Hill reaction.
D. It is a key enzyme in the C4 pathway.

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. It is responsible for detecting light.
B. It is involved in the regulation of pupil size.
C. It is a part of the ciliary body.
D. It is a type of cone cell.

Correct Answer: A

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Question 3
In the context of digestion, what is the primary function of the enzyme amylase?
A. It breaks down proteins into peptides.
B. It is involved in the absorption of fats.
Correct C. It catalyzes the conversion of starch into glu\cose.
D. It is a key enzyme in the C4 pathway.

Correct Answer: C

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Question 4
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'B'?
A. It is responsible for pumping blood throughout the body.
Correct B. It is involved in the regulation of blood pressure.
C. It is a type of vein.
D. It is a part of the lymphatic system.

Correct Answer: B

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Question 5
In the context of growth and regulation, what is the primary function of the hormone insulin?
A. It stimulates the breakdown of glycogen into glu\cose.
Correct B. It is involved in the regulation of blood sugar levels.
C. It is a key hormone in the C4 pathway.
D. It is a type of growth hormone.

Correct Answer: B

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Question 6
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst and hunger?
A. To regulate body temperature
Correct B. To control hunger and thirst
C. To regulate blood pressure
D. To regulate electrolyte balance

Correct Answer: B

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Question 7
What is the primary difference between the xylem and phloem in plants?
Correct A. Xylem transports water and minerals, while phloem transports sugars and amino acids
B. Xylem transports sugars and amino acids, while phloem transports water and minerals
C. Xylem is responsible for photosynthesis, while phloem is responsible for respiration
D. Xylem is responsible for respiration, while phloem is responsible for photosynthesis

Correct Answer: A

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Question 8
In the context of cell division, what is the primary function of the spindle fibers?
Correct A. To separate chromosomes during mitosis
B. To separate chromosomes during meiosis
C. To regulate cell growth and differentiation
D. To regulate cell death and apoptosis

Correct Answer: A

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Question 9
What is the primary function of the olfactory epithelium in the nasal cavity?
A. To detect sound waves
B. To detect light waves
Correct C. To detect smell and pheromones
D. To detect taste and texture

Correct Answer: C

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Question 10
In the context of classification of living things, what is the primary difference between a kingdom and a phylum?
Correct A. A kingdom is a higher taxonomic rank than a phylum
B. A phylum is a higher taxonomic rank than a kingdom
C. A kingdom is a group of related organisms, while a phylum is a group of related species
D. A phylum is a group of related organisms, while a kingdom is a group of related species

Correct Answer: A

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Question 11
In the context of asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 12
A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.
A. Mitochondria
B. Chloroplast
Correct C. Ribosome
D. Lysosome

Correct Answer: C

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Question 13
A patient presents with symptoms of a bacterial infection. The patient's blood culture shows the presence of a gram-positive, catalase-negative bacterium. What is the most likely cause of the infection?
A. Staphylococcus aureus
Correct B. Streptococcus pneumoniae
C. Escherichia coli
D. Pseudomonas aeruginosa

Correct Answer: B

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Question 14
A diagram of a DNA molecule is shown below. Identify the region of the molecule where genetic information is stored.
A. Telomere
B. Centromere
Correct C. Gene
D. Promoter

Correct Answer: C

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Question 15
A diagram of a cell cycle is shown below. Identify the stage of the cell cycle where DNA replication occurs.
A. G1 phase
Correct B. S phase
C. G2 phase
D. Mitosis

Correct Answer: B

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.16
B. 0.32
Correct C. 0.64
D. 0.8

Correct Answer: C

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Question 17
A 2.5 L flask contains 0.5 M HCl. If 1.5 L of the solution is removed and replaced with 1.5 L of 0.5 M NaOH, what is the new concentration of HCl in the flask?
Correct A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: A

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Question 18
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'RR'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 19
A cell divides by mitosis to produce two daughter cells. If the original cell has 16 chromosomes, how many chromosomes will each daughter cell have?
A. 8
Correct B. 16
C. 32
D. 64

Correct Answer: B

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Question 20
A 50-year-old woman has a family history of breast cancer. Her mother and sister both had breast cancer at the age of 40. What is the probability that she will develop breast cancer by the age of 50?
A. 0.1
Correct B. 0.2
C. 0.3
D. 0.4

Correct Answer: B

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Question 21
In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light energy in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
Correct D. Phycobiliproteins

Correct Answer: D

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Question 22
A 25-year-old male patient presents with a 2-year history of progressive weakness and fatigue. His hemoglobin level is 8.5 g/dL, and his mean corpuscular volume (MCV) is 80 fL. Which of the following is the most likely diagnosis?
Correct A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Thalassemia major

Correct Answer: A

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Question 23
A 35-year-old female patient presents with a 5-year history of recurrent episodes of hypoglycemia. Her fasting plasma glu\cose level is 40 mg/dL. Which of the following is the most likely diagnosis?
A. Type 1 diabetes mellitus
B. Type 2 diabetes mellitus
Correct C. Insulinoma
D. Glucagonoma

Correct Answer: C

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Question 24
A 40-year-old male patient presents with a 10-year history of progressive weakness and fatigue. His hemoglobin level is 10.5 g/dL, and his mean corpuscular volume (MCV) is 100 fL. Which of the following is the most likely diagnosis?
A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
Correct D. Thalassemia major

Correct Answer: D

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Question 25
A 30-year-old female patient presents with a 5-year history of recurrent episodes of hypoglycemia. Her fasting plasma glu\cose level is 50 mg/dL. Which of the following is the most likely diagnosis?
A. Type 1 diabetes mellitus
B. Type 2 diabetes mellitus
Correct C. Insulinoma
D. Glucagonoma

Correct Answer: C

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