Q. What is the process by which DNA is copied to produce two identical DNA molecules? (2021)
A.
Transcription
B.
Translation
C.
Replication
D.
Recombination
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Solution
Replication is the process by which DNA is copied to produce two identical DNA molecules.
Correct Answer: C — Replication
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Q. What is the process by which DNA is copied? (2021)
A.
Transcription
B.
Translation
C.
Replication
D.
Recombination
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Solution
Replication is the process by which DNA is copied to produce two identical DNA molecules.
Correct Answer: C — Replication
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Q. What is the process by which energy is transferred from one trophic level to another? (2020)
A.
Photosynthesis
B.
Respiration
C.
Food chain
D.
Decomposition
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Solution
The food chain illustrates how energy is transferred from one trophic level to another in an ecosystem.
Correct Answer: C — Food chain
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Q. What is the process by which nutrients are recycled in an ecosystem? (2020)
A.
Photosynthesis
B.
Decomposition
C.
Respiration
D.
Transpiration
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Solution
Decomposition is the process by which nutrients are recycled in an ecosystem, breaking down dead organic matter.
Correct Answer: B — Decomposition
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Q. What is the process of fusion of male and female gametes called? (2019)
A.
Pollination
B.
Fertilization
C.
Germination
D.
Transpiration
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Solution
The process of fusion of male and female gametes is called fertilization.
Correct Answer: B — Fertilization
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Q. What is the purpose of pre-natal care? (2021)
A.
To ensure the health of the mother and fetus
B.
To promote breastfeeding
C.
To encourage early delivery
D.
To prevent STIs
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Solution
Pre-natal care is aimed at ensuring the health of both the mother and the developing fetus during pregnancy.
Correct Answer: A — To ensure the health of the mother and fetus
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Q. What is the purpose of using a DNA ligase in genetic engineering? (2023)
A.
To cut DNA
B.
To amplify DNA
C.
To join DNA fragments together
D.
To degrade RNA
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Solution
DNA ligase is an enzyme that joins DNA fragments together, which is essential for creating recombinant DNA molecules in genetic engineering.
Correct Answer: C — To join DNA fragments together
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Q. What is the purpose of using a promoter in a recombinant DNA construct? (2021)
A.
To cut the DNA
B.
To initiate transcription of the gene
C.
To stabilize the DNA
D.
To replicate the DNA
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Solution
A promoter is a DNA sequence that initiates transcription of a gene, allowing for the expression of the inserted gene in the host organism.
Correct Answer: B — To initiate transcription of the gene
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Q. What is the purpose of using a promoter in a recombinant DNA molecule? (2021)
A.
To initiate DNA replication
B.
To enhance the stability of the DNA
C.
To drive the expression of the inserted gene
D.
To facilitate DNA repair
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Solution
A promoter is a DNA sequence that initiates transcription of a particular gene, driving the expression of the inserted gene in a recombinant DNA molecule.
Correct Answer: C — To drive the expression of the inserted gene
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Q. What is the purpose of using a selectable marker in a cloning vector? (2021)
A.
To enhance the stability of the vector
B.
To allow for the identification of successfully transformed cells
C.
To increase the replication rate of the vector
D.
To facilitate the insertion of foreign DNA
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Solution
Selectable markers are genes that confer resistance to antibiotics or other substances, allowing for the identification of cells that have successfully taken up the vector.
Correct Answer: B — To allow for the identification of successfully transformed cells
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Q. What is the purpose of using a selectable marker in genetic engineering? (2023)
A.
To enhance gene expression
B.
To identify successfully transformed cells
C.
To increase DNA stability
D.
To promote cell division
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Solution
Selectable markers are genes that confer resistance to antibiotics or other substances, allowing researchers to identify cells that have successfully taken up the recombinant DNA.
Correct Answer: B — To identify successfully transformed cells
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Q. What is the purpose of using biopesticides in agriculture? (2023)
A.
To increase soil fertility
B.
To control pests using natural organisms
C.
To enhance crop growth
D.
To improve water retention
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Solution
Biopesticides are used to control pests through natural organisms, making option 'To control pests using natural organisms' the correct answer.
Correct Answer: B — To control pests using natural organisms
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Q. What is the purpose of using CRISPR technology in biotechnology? (2023)
A.
To clone organisms
B.
To edit genes
C.
To produce vaccines
D.
To sequence DNA
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Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA.
Correct Answer: B — To edit genes
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Q. What is the purpose of using DNA fingerprinting in forensic science? (2023)
A.
To identify individuals
B.
To clone organisms
C.
To produce vaccines
D.
To enhance crop yield
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Solution
DNA fingerprinting is used to identify individuals based on their unique DNA profiles, making it crucial in forensic science.
Correct Answer: A — To identify individuals
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Q. What is the purpose of using markers in genetically modified crops? (2021)
A.
To enhance flavor
B.
To track genetic changes
C.
To increase size
D.
To improve color
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Solution
Markers are used to track genetic changes and ensure the desired traits are present in genetically modified crops.
Correct Answer: B — To track genetic changes
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Q. What is the purpose of using plasmids in genetic engineering? (2023)
A.
To increase crop yield
B.
To serve as vectors for gene transfer
C.
To produce antibiotics
D.
To enhance photosynthesis
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Solution
Plasmids are used as vectors to transfer genes into host cells in genetic engineering.
Correct Answer: B — To serve as vectors for gene transfer
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Q. What is the purpose of using restriction enzymes in genetic engineering? (2023)
A.
To cut DNA at specific sites
B.
To amplify DNA
C.
To sequence DNA
D.
To repair DNA
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Solution
Restriction enzymes are used to cut DNA at specific sequences, which is essential for cloning and genetic engineering.
Correct Answer: A — To cut DNA at specific sites
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Q. What is the resting membrane potential of a typical neuron? (2020)
A.
-70 mV
B.
-50 mV
C.
0 mV
D.
+30 mV
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Solution
The resting membrane potential of a typical neuron is approximately -70 mV.
Correct Answer: A — -70 mV
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Q. What is the result of cytokinesis in animal cells? (2020)
A.
Formation of a cell plate
B.
Formation of two daughter cells
C.
Replication of DNA
D.
Separation of sister chromatids
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Solution
Cytokinesis results in the physical separation of the cytoplasm, leading to the formation of two daughter cells.
Correct Answer: B — Formation of two daughter cells
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Q. What is the role of a Punnett square? (2023)
A.
To determine the phenotype of an organism
B.
To predict the genotypes of offspring
C.
To identify mutations
D.
To analyze genetic disorders
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Solution
A Punnett square is used to predict the genotypes of offspring from a genetic cross.
Correct Answer: B — To predict the genotypes of offspring
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Q. What is the role of Agrobacterium tumefaciens in biotechnology? (2021)
A.
Gene delivery
B.
Protein synthesis
C.
Cell division
D.
DNA replication
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Solution
Agrobacterium tumefaciens is used as a vector for gene delivery in plant biotechnology.
Correct Answer: A — Gene delivery
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Q. What is the role of Agrobacterium tumefaciens in genetic engineering? (2022)
A.
It acts as a vector
B.
It is a source of restriction enzymes
C.
It is used for DNA sequencing
D.
It helps in protein synthesis
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Solution
Agrobacterium tumefaciens is used as a vector to transfer genes into plant cells.
Correct Answer: A — It acts as a vector
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Q. What is the role of aldosterone in the body? (2021)
A.
Increase blood glucose
B.
Regulate sodium and potassium levels
C.
Stimulate milk production
D.
Enhance immune response
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Solution
Aldosterone is a hormone produced by the adrenal cortex that helps regulate sodium and potassium levels, thus influencing blood pressure.
Correct Answer: B — Regulate sodium and potassium levels
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Q. What is the role of biopesticides in agriculture? (2021)
A.
Increase soil fertility
B.
Control pest populations
C.
Enhance crop yield
D.
Improve water retention
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Solution
Biopesticides are used to control pest populations in an environmentally friendly manner, reducing the reliance on chemical pesticides.
Correct Answer: B — Control pest populations
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Q. What is the role of Bt toxin in genetically modified crops? (2022)
A.
Enhances growth rate
B.
Provides resistance to herbivores
C.
Increases photosynthesis
D.
Improves soil quality
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Solution
Bt toxin is produced by Bacillus thuringiensis and provides resistance to certain insect pests.
Correct Answer: B — Provides resistance to herbivores
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Q. What is the role of calcium ions in muscle contraction? (2022)
A.
To provide energy
B.
To bind to troponin
C.
To stimulate nerve impulses
D.
To form cross-bridges
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Solution
Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.
Correct Answer: B — To bind to troponin
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Q. What is the role of chlorophyll in leaves? (2023)
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Gas exchange
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Solution
Chlorophyll is essential for photosynthesis as it captures light energy to convert carbon dioxide and water into glucose.
Correct Answer: C — Photosynthesis
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Q. What is the role of chloroplasts in plant cells? (2021)
A.
Respiration
B.
Photosynthesis
C.
Digestion
D.
Reproduction
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Solution
Chloroplasts are responsible for photosynthesis, converting light energy into chemical energy.
Correct Answer: B — Photosynthesis
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Q. What is the role of condoms in reproductive health? (2021)
A.
To enhance pleasure
B.
To prevent pregnancy and STIs
C.
To increase fertility
D.
To promote sexual activity
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Solution
Condoms are used to prevent both pregnancy and the transmission of sexually transmitted infections (STIs).
Correct Answer: B — To prevent pregnancy and STIs
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Q. What is the role of cyclins in the cell cycle? (2019)
A.
To inhibit cell division
B.
To promote apoptosis
C.
To regulate the cell cycle
D.
To repair DNA
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Solution
Cyclins are proteins that regulate the progression of the cell cycle by activating cyclin-dependent kinases (CDKs).
Correct Answer: C — To regulate the cell cycle
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