Q. What is the purpose of marker-assisted selection in plant breeding?
A.
To identify plants with desirable traits
B.
To increase genetic diversity
C.
To enhance photosynthetic efficiency
D.
To reduce water requirements
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Solution
Marker-assisted selection helps breeders identify plants that carry desirable traits based on genetic markers.
Correct Answer: A — To identify plants with desirable traits
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Q. What is the purpose of using biopesticides in plant biotechnology?
A.
To enhance plant growth
B.
To control pest populations
C.
To improve seed germination
D.
To increase photosynthetic efficiency
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Solution
Biopesticides are used to control pest populations in an environmentally friendly manner, reducing reliance on chemical pesticides.
Correct Answer: B — To control pest populations
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Q. What is the purpose of using marker-assisted selection in plant breeding?
A.
To identify and select plants with desirable traits
B.
To enhance photosynthetic efficiency
C.
To increase seed size
D.
To improve soil fertility
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Solution
Marker-assisted selection is used to identify and select plants with desirable traits more efficiently in breeding programs.
Correct Answer: A — To identify and select plants with desirable traits
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Q. What is the purpose of using restriction enzymes in molecular biology?
A.
To amplify DNA
B.
To cut DNA at specific sequences
C.
To synthesize RNA
D.
To visualize proteins
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Solution
Restriction enzymes cut DNA at specific sequences, allowing for the manipulation and cloning of DNA fragments.
Correct Answer: B — To cut DNA at specific sequences
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Q. What is the purpose of using restriction enzymes in recombinant DNA technology?
A.
To amplify DNA
B.
To cut DNA at specific sequences
C.
To synthesize RNA
D.
To clone entire genomes
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Solution
Restriction enzymes cut DNA at specific sequences, allowing for the insertion of foreign DNA into vectors.
Correct Answer: B — To cut DNA at specific sequences
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Q. What is the purpose of using reverse transcriptase in molecular biology?
A.
To synthesize DNA from RNA
B.
To amplify DNA
C.
To cut DNA at specific sites
D.
To clone DNA
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Solution
Reverse transcriptase is used to synthesize complementary DNA (cDNA) from an RNA template.
Correct Answer: A — To synthesize DNA from RNA
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Q. What is the recommended contact time for a 10% bleach solution to effectively disinfect surfaces?
A.
1 minute
B.
5 minutes
C.
10 minutes
D.
15 minutes
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Solution
A 10% bleach solution is recommended to be in contact with surfaces for at least 5 minutes for effective disinfection.
Correct Answer: B — 5 minutes
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Q. What is the relationship between photosynthesis and respiration in plants?
A.
They are the same process
B.
Photosynthesis produces oxygen for respiration
C.
Respiration produces glucose for photosynthesis
D.
They occur in different organisms
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Solution
Photosynthesis produces oxygen, which is then used in respiration, highlighting their interdependent relationship.
Correct Answer: B — Photosynthesis produces oxygen for respiration
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Q. What is the role of a biological indicator in sterilization processes?
A.
To measure temperature
B.
To confirm the presence of microorganisms
C.
To verify the effectiveness of sterilization
D.
To disinfect surfaces
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Solution
Biological indicators are used to verify the effectiveness of sterilization by demonstrating that spores have been killed.
Correct Answer: C — To verify the effectiveness of sterilization
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Q. What is the role of a biological indicator in sterilization?
A.
To measure temperature
B.
To confirm the presence of microorganisms
C.
To verify the effectiveness of the sterilization process
D.
To indicate the type of sterilization method used
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Solution
Biological indicators are used to verify the effectiveness of the sterilization process by confirming the destruction of specific microorganisms.
Correct Answer: C — To verify the effectiveness of the sterilization process
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Q. What is the role of a vector in recombinant DNA technology?
A.
To amplify RNA
B.
To carry foreign DNA into a host cell
C.
To cut DNA at specific sites
D.
To synthesize proteins
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Solution
A vector is a DNA molecule used to carry foreign DNA into a host cell for replication and expression.
Correct Answer: B — To carry foreign DNA into a host cell
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Q. What is the role of abscisic acid in plants?
A.
Promotes seed germination
B.
Inhibits growth during stress
C.
Stimulates flowering
D.
Enhances fruit ripening
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Solution
Abscisic acid primarily functions to inhibit growth and promote stress responses in plants.
Correct Answer: B — Inhibits growth during stress
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Q. What is the role of actinobacteria in soil health?
A.
They cause plant diseases
B.
They decompose organic matter
C.
They fix carbon dioxide
D.
They produce antibiotics
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Solution
Actinobacteria play a crucial role in decomposing organic matter, contributing to nutrient cycling in soil.
Correct Answer: B — They decompose organic matter
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Q. What is the role of Agrobacterium tumefaciens in plant biotechnology?
A.
It enhances photosynthesis
B.
It acts as a vector for gene transfer
C.
It improves root growth
D.
It increases resistance to pests
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Solution
Agrobacterium tumefaciens is used as a vector for gene transfer in plant biotechnology, facilitating the introduction of new genes into plant cells.
Correct Answer: B — It acts as a vector for gene transfer
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Q. What is the role of alcohol in disinfection?
A.
To kill spores
B.
To denature proteins and disrupt membranes
C.
To oxidize cellular components
D.
To inhibit nucleic acid synthesis
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Solution
Alcohol acts as a disinfectant by denaturing proteins and disrupting cellular membranes, making it effective against many microorganisms.
Correct Answer: B — To denature proteins and disrupt membranes
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Q. What is the role of alkaloids in plants?
A.
Photosynthesis
B.
Defense against herbivores
C.
Water storage
D.
Nutrient absorption
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Solution
Alkaloids serve as a defense mechanism against herbivores due to their toxicity.
Correct Answer: B — Defense against herbivores
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Q. What is the role of amniotic fluid during pregnancy?
A.
To provide nutrients to the fetus
B.
To cushion the fetus and allow for movement
C.
To facilitate gas exchange
D.
To regulate maternal blood pressure
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Solution
Amniotic fluid cushions the fetus, allowing for movement and protecting it from external shocks.
Correct Answer: B — To cushion the fetus and allow for movement
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Q. What is the role of amniotic fluid?
A.
To provide nutrients to the fetus
B.
To cushion the fetus and allow for movement
C.
To facilitate gas exchange
D.
To produce hormones
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Solution
Amniotic fluid surrounds the fetus, providing cushioning and allowing for movement, which is essential for musculoskeletal development.
Correct Answer: B — To cushion the fetus and allow for movement
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Q. What is the role of antibodies in the immune response?
A.
Directly kill pathogens
B.
Neutralize toxins and pathogens
C.
Activate complement system
D.
All of the above
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Solution
Antibodies play multiple roles in the immune response, including neutralizing toxins and pathogens, opsonizing for phagocytosis, and activating the complement system.
Correct Answer: D — All of the above
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Q. What is the role of antibodies in the immune system?
A.
To directly kill pathogens
B.
To neutralize toxins
C.
To enhance phagocytosis
D.
All of the above
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Solution
Antibodies play multiple roles in the immune response, including neutralizing toxins, enhancing phagocytosis, and directly targeting pathogens.
Correct Answer: D — All of the above
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Q. What is the role of antigen-presenting cells (APCs) in the immune response?
A.
To produce antibodies
B.
To present antigens to T cells
C.
To directly kill pathogens
D.
To secrete cytokines
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Solution
Antigen-presenting cells (APCs) process and present antigens to T cells, initiating the adaptive immune response.
Correct Answer: B — To present antigens to T cells
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Q. What is the role of ATP and NADPH in the Calvin cycle?
A.
Energy and reducing power
B.
Oxygen production
C.
Carbon fixation
D.
Light absorption
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Solution
ATP provides energy and NADPH provides reducing power for the Calvin cycle.
Correct Answer: A — Energy and reducing power
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Q. What is the role of ATP and NADPH produced in the light reactions?
A.
To provide energy and reducing power for the Calvin cycle
B.
To produce glucose directly
C.
To transport water
D.
To release oxygen
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Solution
ATP and NADPH provide the energy and reducing power needed for the Calvin cycle.
Correct Answer: A — To provide energy and reducing power for the Calvin cycle
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Q. What is the role of ATP in the light-independent reactions?
A.
Energy source
B.
Electron carrier
C.
Carbon source
D.
None of the above
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Solution
ATP serves as the energy source for the light-independent reactions (Calvin cycle).
Correct Answer: A — Energy source
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Q. What is the role of ATP synthase in photosynthesis?
A.
To absorb light
B.
To fix carbon
C.
To synthesize ATP
D.
To transport electrons
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Solution
ATP synthase synthesizes ATP from ADP and inorganic phosphate during the light reactions.
Correct Answer: C — To synthesize ATP
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Q. What is the role of autoclaving in sterilization?
A.
It uses chemical agents to kill microorganisms.
B.
It uses high pressure and steam to achieve sterilization.
C.
It relies on ultraviolet light to disinfect surfaces.
D.
It is a method of physical disinfection only.
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Solution
Autoclaving uses high pressure and steam to achieve sterilization, effectively killing all microorganisms, including spores.
Correct Answer: B — It uses high pressure and steam to achieve sterilization.
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Q. What is the role of auxins in apical dominance?
A.
Promote lateral bud growth
B.
Inhibit lateral bud growth
C.
Stimulate root growth
D.
Enhance leaf growth
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Solution
Auxins inhibit the growth of lateral buds, maintaining apical dominance in plants.
Correct Answer: B — Inhibit lateral bud growth
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Q. What is the role of bile in digestion?
A.
Breaks down carbohydrates
B.
Emulsifies fats
C.
Digests proteins
D.
Absorbs nutrients
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Solution
Bile emulsifies fats, breaking them down into smaller droplets to enhance digestion and absorption.
Correct Answer: B — Emulsifies fats
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Q. What is the role of chlorophyll in photosynthesis?
A.
To absorb water
B.
To capture light energy
C.
To synthesize glucose
D.
To release oxygen
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Solution
Chlorophyll captures light energy, which is essential for the light reactions of photosynthesis.
Correct Answer: B — To capture light energy
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Q. What is the role of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Light absorption for photosynthesis
D.
Root growth
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Solution
Chlorophyll is the pigment that absorbs light energy for photosynthesis.
Correct Answer: C — Light absorption for photosynthesis
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