Q. Which chemical agent is commonly used for high-level disinfection?
-
A.
Ethanol
-
B.
Chlorine
-
C.
Glutaraldehyde
-
D.
Hydrogen peroxide
Solution
Glutaraldehyde is widely used for high-level disinfection of medical equipment.
Correct Answer: C — Glutaraldehyde
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Q. Which circulatory system is found in mammals?
-
A.
Open circulatory system
-
B.
Closed circulatory system
-
C.
Lymphatic system
-
D.
Pulmonary system
Solution
Mammals have a closed circulatory system, where blood is contained within vessels.
Correct Answer: B — Closed circulatory system
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Q. Which classification level comes directly after 'Family' in the taxonomic hierarchy?
-
A.
Order
-
B.
Genus
-
C.
Species
-
D.
Class
Solution
The taxonomic hierarchy follows the order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
Correct Answer: B — Genus
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Q. Which classification level comes directly after 'Kingdom' in the hierarchy of biological classification?
-
A.
Phylum
-
B.
Class
-
C.
Order
-
D.
Family
Solution
The classification level that comes directly after 'Kingdom' is 'Phylum'.
Correct Answer: A — Phylum
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Q. Which classification level comes directly after 'Kingdom' in the taxonomic hierarchy?
-
A.
Phylum
-
B.
Class
-
C.
Order
-
D.
Family
Solution
In the taxonomic hierarchy, 'Phylum' is the classification level that comes directly after 'Kingdom'.
Correct Answer: A — Phylum
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Q. Which classification level is directly below 'Family'?
-
A.
Order
-
B.
Genus
-
C.
Species
-
D.
Class
Solution
The classification level directly below 'Family' is 'Genus'.
Correct Answer: B — Genus
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Q. Which classification system is most widely used in modern botany?
-
A.
Linnaean system
-
B.
Phylogenetic system
-
C.
Cladistic system
-
D.
Phenetic system
Solution
The phylogenetic system is widely used in modern botany as it reflects evolutionary relationships.
Correct Answer: B — Phylogenetic system
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Q. Which component of blood is primarily responsible for clotting?
-
A.
Red blood cells
-
B.
White blood cells
-
C.
Platelets
-
D.
Plasma
Solution
Platelets are the component of blood primarily responsible for clotting.
Correct Answer: C — Platelets
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Q. Which component of blood is primarily responsible for oxygen transport?
-
A.
Plasma
-
B.
White blood cells
-
C.
Platelets
-
D.
Red blood cells
Solution
Red blood cells are primarily responsible for transporting oxygen throughout the body.
Correct Answer: D — Red blood cells
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Q. Which component of blood is primarily responsible for transporting oxygen?
-
A.
Plasma
-
B.
White blood cells
-
C.
Platelets
-
D.
Red blood cells
Solution
Red blood cells contain hemoglobin, which binds to oxygen and transports it throughout the body.
Correct Answer: D — Red blood cells
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Q. Which condition is characterized by the inflammation of the airways, leading to difficulty in breathing?
-
A.
Asthma
-
B.
Pneumonia
-
C.
Bronchitis
-
D.
Emphysema
Solution
Asthma is a condition characterized by inflammation of the airways, causing difficulty in breathing.
Correct Answer: A — Asthma
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Q. Which condition is characterized by the inflammation of the airways?
-
A.
Asthma
-
B.
Pneumonia
-
C.
Bronchitis
-
D.
Emphysema
Solution
Bronchitis is characterized by the inflammation of the airways, leading to coughing and difficulty breathing.
Correct Answer: C — Bronchitis
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Q. Which condition is characterized by the inflammation of the bronchi?
-
A.
Asthma
-
B.
Bronchitis
-
C.
Pneumonia
-
D.
Emphysema
Solution
Bronchitis is the inflammation of the bronchi, often caused by infection or irritants.
Correct Answer: B — Bronchitis
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Q. Which cytokine is known for its role in promoting the differentiation of T cells?
-
A.
Interleukin-1
-
B.
Interleukin-2
-
C.
Tumor necrosis factor
-
D.
Interferon-gamma
Solution
Interleukin-2 is crucial for the proliferation and differentiation of T cells during the immune response.
Correct Answer: B — Interleukin-2
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Q. Which cytokine is primarily involved in the activation of T cells?
-
A.
Interleukin-1
-
B.
Interleukin-2
-
C.
Tumor necrosis factor-alpha
-
D.
Interferon-gamma
Solution
Interleukin-2 is crucial for T cell proliferation and activation, making it a key cytokine in the immune response.
Correct Answer: B — Interleukin-2
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Q. Which cytokine is primarily involved in the differentiation of naive T cells into Th1 cells?
-
A.
IL-4
-
B.
IL-12
-
C.
IFN-gamma
-
D.
TGF-beta
Solution
IL-12 is crucial for the differentiation of naive T cells into Th1 cells, which are important for cell-mediated immunity.
Correct Answer: B — IL-12
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Q. Which cytokine is primarily responsible for activating macrophages during an immune response?
-
A.
IL-1
-
B.
IL-6
-
C.
IFN-gamma
-
D.
TNF-alpha
Solution
IFN-gamma is the key cytokine that activates macrophages, enhancing their ability to phagocytose pathogens.
Correct Answer: C — IFN-gamma
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Q. Which cytokine is primarily responsible for the differentiation of naive T cells into Th1 cells?
-
A.
IL-4
-
B.
IL-12
-
C.
IFN-gamma
-
D.
TNF-alpha
Solution
IL-12 is the key cytokine that promotes the differentiation of naive T cells into Th1 cells, which are important for cell-mediated immunity.
Correct Answer: B — IL-12
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Q. Which digestive disorder is characterized by inflammation of the stomach lining?
-
A.
Gastritis
-
B.
Irritable bowel syndrome
-
C.
Celiac disease
-
D.
Diverticulitis
Solution
Gastritis is the inflammation of the stomach lining, often causing pain and discomfort.
Correct Answer: A — Gastritis
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Q. Which environmental factor can limit the rate of photosynthesis?
-
A.
Temperature
-
B.
Soil pH
-
C.
Wind speed
-
D.
Humidity
Solution
Temperature can limit the rate of photosynthesis, as enzymes involved are temperature-sensitive.
Correct Answer: A — Temperature
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Q. Which environmental factor is most critical for seed germination?
-
A.
Light
-
B.
Temperature
-
C.
Soil type
-
D.
Humidity
Solution
Temperature is a critical factor for seed germination, as it affects metabolic processes.
Correct Answer: B — Temperature
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Q. Which enzyme begins the digestion of carbohydrates in the mouth?
-
A.
Pepsin
-
B.
Amylase
-
C.
Lipase
-
D.
Trypsin
Solution
Salivary amylase is the enzyme that begins the digestion of carbohydrates in the mouth.
Correct Answer: B — Amylase
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Q. Which enzyme catalyzes the first step of the Calvin cycle?
-
A.
Rubisco
-
B.
ATP synthase
-
C.
NADP+ reductase
-
D.
Phosphofructokinase
Solution
Rubisco catalyzes the first step of the Calvin cycle by fixing carbon dioxide.
Correct Answer: A — Rubisco
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Q. Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?
-
A.
Rubisco
-
B.
ATP synthase
-
C.
NADP+ reductase
-
D.
Phosphofructokinase
Solution
Rubisco is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: A — Rubisco
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Q. Which enzyme is crucial for carbon fixation in the Calvin cycle?
-
A.
Rubisco
-
B.
ATP synthase
-
C.
NADP+ reductase
-
D.
Phosphofructokinase
Solution
Rubisco is the enzyme that catalyzes the first step of carbon fixation in the Calvin cycle.
Correct Answer: A — Rubisco
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Q. Which enzyme is essential for synthesizing new DNA strands during PCR?
-
A.
DNA ligase
-
B.
Taq polymerase
-
C.
Reverse transcriptase
-
D.
Restriction enzyme
Solution
Taq polymerase is a heat-stable enzyme that synthesizes new DNA strands during the PCR process.
Correct Answer: B — Taq polymerase
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Q. Which enzyme is essential for the PCR process?
-
A.
DNA ligase
-
B.
Taq polymerase
-
C.
Reverse transcriptase
-
D.
Restriction enzyme
Solution
Taq polymerase is a heat-stable enzyme that synthesizes new DNA strands during the PCR process.
Correct Answer: B — Taq polymerase
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Q. Which enzyme is primarily responsible for synthesizing new DNA strands during PCR?
-
A.
DNA ligase
-
B.
Taq polymerase
-
C.
Restriction enzyme
-
D.
RNA polymerase
Solution
Taq polymerase is a heat-stable enzyme that synthesizes new DNA strands during the PCR process.
Correct Answer: B — Taq polymerase
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Q. Which enzyme is primarily responsible for the digestion of carbohydrates in the human digestive system?
-
A.
Amylase
-
B.
Pepsin
-
C.
Lipase
-
D.
Trypsin
Solution
Amylase is the enzyme that breaks down carbohydrates into simpler sugars.
Correct Answer: A — Amylase
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Q. Which enzyme is responsible for breaking down carbohydrates in the human digestive system?
-
A.
Amylase
-
B.
Pepsin
-
C.
Lipase
-
D.
Trypsin
Solution
Amylase is the enzyme that breaks down carbohydrates into simpler sugars.
Correct Answer: A — Amylase
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