Q. What is the main advantage of using transgenic animals in research? (2021)
A.
Increased lifespan
B.
Disease modeling
C.
Higher reproduction rate
D.
Better growth rate
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Solution
Transgenic animals are primarily used in research for disease modeling, helping scientists understand human diseases.
Correct Answer:
B
— Disease modeling
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Q. What is the main advantage of using transgenic plants? (2022)
A.
Higher nutritional value
B.
Increased growth rate
C.
Resistance to herbicides
D.
Faster reproduction
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Solution
Transgenic plants are engineered to be resistant to herbicides, allowing for easier weed management.
Correct Answer:
C
— Resistance to herbicides
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Q. What is the main advantage of using yeast as a host for cloning? (2023)
A.
High growth rate
B.
Eukaryotic post-translational modifications
C.
Simple genome
D.
Low cost
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Solution
Yeast, being a eukaryote, can perform post-translational modifications similar to higher organisms, making it advantageous for expressing eukaryotic proteins.
Correct Answer:
B
— Eukaryotic post-translational modifications
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Q. What is the main application of CRISPR technology? (2023)
A.
Gene therapy
B.
Gene editing
C.
DNA sequencing
D.
Protein synthesis
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Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA.
Correct Answer:
B
— Gene editing
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Q. What is the main assumption of the quantum mechanical model of the atom? (2023)
A.
Electrons are in fixed orbits
B.
Electrons have wave-like properties
C.
Electrons are stationary
D.
Electrons have no mass
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Solution
The quantum mechanical model assumes that electrons exhibit both particle and wave-like properties.
Correct Answer:
B
— Electrons have wave-like properties
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Q. What is the main benefit of using genetically modified crops? (2023)
A.
Higher cost of production
B.
Increased resistance to pests
C.
Decreased yield
D.
Longer growth periods
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Solution
Genetically modified crops are designed to be more resistant to pests, which can lead to higher yields and reduced pesticide use.
Correct Answer:
B
— Increased resistance to pests
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Q. What is the main carbohydrate found in the human diet? (2023)
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Fructose
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Solution
Starch is the main carbohydrate found in the human diet, primarily sourced from plants.
Correct Answer:
A
— Starch
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Q. What is the main cause of tuberculosis? (2019)
A.
Bacterial infection
B.
Viral infection
C.
Fungal infection
D.
Parasitic infection
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer:
A
— Bacterial infection
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Q. What is the main characteristic of a molecular solid? (2021)
A.
High melting point
B.
Low melting point
C.
Good electrical conductivity
D.
High density
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Solution
Molecular solids generally have low melting points due to weak intermolecular forces.
Correct Answer:
B
— Low melting point
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Q. What is the main characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
Anisotropic
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Solution
Amorphous solids lack long-range order, which distinguishes them from crystalline solids.
Correct Answer:
B
— Short-range order
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Q. What is the main characteristic of cardiac muscle tissue? (2023)
A.
Multinucleated
B.
Involuntary and striated
C.
Non-striated and voluntary
D.
Highly regenerative
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Solution
Cardiac muscle tissue is involuntary and striated, found only in the heart, and is responsible for pumping blood.
Correct Answer:
B
— Involuntary and striated
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Q. What is the main characteristic of elastomers?
A.
Brittle
B.
Elastic
C.
Rigid
D.
Transparent
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Solution
Elastomers are characterized by their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer:
B
— Elastic
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Q. What is the main characteristic of mammals? (2021)
A.
Cold-blooded
B.
Feathers
C.
Hair or fur
D.
Scales
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Solution
Mammals are characterized by the presence of hair or fur and mammary glands that produce milk.
Correct Answer:
C
— Hair or fur
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Q. What is the main characteristic of organisms in the phylum Mollusca? (2022)
A.
Jointed appendages
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton
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Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of organisms in the phylum Porifera? (2022)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
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Solution
Organisms in the phylum Porifera, commonly known as sponges, are characterized by the presence of pores in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main characteristic of the phylum Mollusca? (2021)
A.
Jointed legs
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton made of chitin
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Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of the phylum Porifera? (2021)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
Show solution
Solution
Porifera, or sponges, are characterized by the presence of numerous pores (ostia) in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main component of a nuclear reactor that slows down neutrons? (2023)
A.
Control rods
B.
Moderator
C.
Coolant
D.
Shielding
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Solution
The moderator is the main component in a nuclear reactor that slows down neutrons to sustain the nuclear chain reaction.
Correct Answer:
B
— Moderator
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Q. What is the main component of natural rubber?
A.
Polyisoprene
B.
Polystyrene
C.
Polyethylene
D.
Polyvinyl acetate
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Solution
Natural rubber is primarily composed of polyisoprene, which is derived from latex.
Correct Answer:
A
— Polyisoprene
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Q. What is the main component of plasma in blood? (2023)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Hormones
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Solution
Plasma is primarily composed of about 90% water, which serves as a solvent for various substances in the blood.
Correct Answer:
A
— Water
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Q. What is the main component of the cell wall in plant cells? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The cell wall of plant cells is primarily made of cellulose, which provides structural support.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the cell wall in plants? (2022)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The main component of the plant cell wall is cellulose.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the gas known as 'syngas'? (2023)
A.
Carbon dioxide
B.
Hydrogen
C.
Methane
D.
Nitrogen
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Solution
Syngas primarily consists of hydrogen and carbon monoxide, used in various chemical processes.
Correct Answer:
B
— Hydrogen
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Q. What is the main component of urine? (2022)
A.
Water
B.
Urea
C.
Sodium chloride
D.
Creatinine
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Solution
The main component of urine is water, which makes up about 95% of its volume.
Correct Answer:
A
— Water
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Q. What is the main consequence of nuclear fusion? (2023)
A.
Release of energy
B.
Formation of heavier elements
C.
Emission of alpha particles
D.
All of the above
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Solution
The main consequence of nuclear fusion is the release of a significant amount of energy as lighter nuclei combine to form heavier nuclei.
Correct Answer:
A
— Release of energy
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Q. What is the main consequence of plastic pollution in oceans? (2023)
A.
Increased fish populations
B.
Coral reef restoration
C.
Marine life entanglement
D.
Improved water quality
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Solution
Plastic pollution in oceans leads to entanglement and ingestion by marine life, causing injury and death to various species.
Correct Answer:
C
— Marine life entanglement
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Q. What is the main difference between isotopes of an element? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons
D.
Chemical properties
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Solution
Isotopes of an element differ in the number of neutrons while having the same number of protons.
Correct Answer:
B
— Number of neutrons
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Q. What is the main difference between the kingdoms Fungi and Plantae? (2022)
A.
Cell wall composition
B.
Mode of nutrition
C.
Reproductive methods
D.
All of the above
Show solution
Solution
The main differences between the kingdoms Fungi and Plantae include cell wall composition (chitin in fungi vs cellulose in plants) and mode of nutrition (heterotrophic in fungi vs autotrophic in plants).
Correct Answer:
D
— All of the above
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Q. What is the main disadvantage of asexual reproduction? (2022)
A.
Slower reproduction rate
B.
Lack of genetic variation
C.
Requires more energy
D.
Involves two parents
Show solution
Solution
The main disadvantage of asexual reproduction is the lack of genetic variation, which can make populations vulnerable to diseases.
Correct Answer:
B
— Lack of genetic variation
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Q. What is the main driving force behind adaptive radiation? (1959)
A.
Environmental changes
B.
Genetic mutations
C.
Isolation
D.
All of the above
Show solution
Solution
Adaptive radiation occurs when a single ancestor species rapidly diversifies into a wide variety of forms to adapt to different environments, driven by environmental changes, genetic mutations, and isolation.
Correct Answer:
D
— All of the above
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