Q. What is the function of a promoter in a gene? (2023)
A.
To enhance gene expression
B.
To initiate transcription
C.
To terminate transcription
D.
To bind to ribosomes
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Solution
A promoter is a DNA sequence that initiates transcription of a gene by providing a binding site for RNA polymerase.
Correct Answer:
B
— To initiate transcription
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Q. What is the function of a promoter in a recombinant DNA molecule? (2023)
A.
To initiate transcription
B.
To terminate transcription
C.
To enhance translation
D.
To degrade RNA
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Solution
A promoter is a DNA sequence that initiates transcription of a particular gene, allowing for gene expression.
Correct Answer:
A
— To initiate transcription
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Q. What is the function of a selectable marker in a cloning vector? (2023)
A.
To enhance gene expression
B.
To allow for the identification of successfully transformed cells
C.
To provide energy for the cell
D.
To stabilize the 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 function of a transistor in a circuit? (2021)
A.
Amplification
B.
Rectification
C.
Capacitance
D.
Inductance
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Solution
A transistor is primarily used for amplification of signals in electronic circuits.
Correct Answer:
A
— Amplification
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Q. What is the function of an email client?
A.
To host websites
B.
To send and receive emails
C.
To create web pages
D.
To manage databases
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Solution
An email client is software used to send and receive emails.
Correct Answer:
B
— To send and receive emails
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Q. What is the function of bile in digestion? (2022)
A.
Breaks down proteins
B.
Emulsifies fats
C.
Digests carbohydrates
D.
Absorbs vitamins
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Solution
Bile emulsifies fats, making them easier to digest by lipases.
Correct Answer:
B
— Emulsifies fats
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Q. What is the function of cartilage in the body? (2022)
A.
Support and flexibility
B.
Storage of fat
C.
Transmission of impulses
D.
Protection
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Solution
Cartilage provides support and flexibility in the body.
Correct Answer:
A
— Support and flexibility
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Q. What is the function of chlorophyll in plants? (2022)
A.
Absorbing water
B.
Absorbing sunlight
C.
Transporting nutrients
D.
Storing energy
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Solution
Chlorophyll is the pigment in plants that absorbs sunlight, which is essential for photosynthesis.
Correct Answer:
B
— Absorbing sunlight
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Q. What is the function of chloroplasts in plant cells? (2022)
A.
Energy production
B.
Photosynthesis
C.
Cell division
D.
Protein synthesis
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Solution
Chloroplasts are the organelles in plant cells where photosynthesis occurs, converting light energy into chemical energy.
Correct Answer:
B
— Photosynthesis
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Q. What is the function of chloroplasts? (2023)
A.
Respiration
B.
Photosynthesis
C.
Digestion
D.
Reproduction
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Solution
Chloroplasts are responsible for photosynthesis, converting light energy into chemical energy in plants.
Correct Answer:
B
— Photosynthesis
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Q. What is the function of DNA polymerase? (2021)
A.
Synthesizes RNA
B.
Replicates DNA
C.
Repairs DNA
D.
Transcribes DNA
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Solution
DNA polymerase is an enzyme that synthesizes new strands of DNA during replication.
Correct Answer:
B
— Replicates DNA
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Q. What is the function of glucagon? (2019)
A.
Lower blood sugar
B.
Increase blood sugar
C.
Regulate metabolism
D.
Stimulate growth
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Solution
Glucagon is a hormone produced by the pancreas that raises blood sugar levels by promoting the conversion of glycogen to glucose in the liver.
Correct Answer:
B
— Increase blood sugar
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Q. What is the function of hemoglobin in the body?
A.
To catalyze reactions
B.
To transport oxygen
C.
To provide structural support
D.
To store energy
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Solution
Hemoglobin is a protein that functions to transport oxygen from the lungs to tissues throughout the body.
Correct Answer:
B
— To transport oxygen
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Q. What is the function of lysosomes? (2018)
A.
Energy production
B.
Digestion of macromolecules
C.
Protein synthesis
D.
Cell division
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Solution
Lysosomes contain digestive enzymes that break down macromolecules, old cell parts, and microorganisms.
Correct Answer:
B
— Digestion of macromolecules
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Q. What is the function of mitochondria in a cell? (2022)
A.
Photosynthesis
B.
Energy production
C.
Protein synthesis
D.
Cell division
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Solution
Mitochondria are known as the powerhouses of the cell, generating ATP through cellular respiration.
Correct Answer:
B
— Energy production
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Q. What is the function of mRNA in protein synthesis? (2021)
A.
Transports amino acids
B.
Carries genetic code from DNA
C.
Forms ribosomes
D.
Catalyzes reactions
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Solution
mRNA (messenger RNA) carries the genetic code from DNA to the ribosome, where proteins are synthesized.
Correct Answer:
B
— Carries genetic code from DNA
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Q. What is the function of NADP+ in photosynthesis? (2019)
A.
Energy storage
B.
Electron carrier
C.
Carbon fixation
D.
Light absorption
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Solution
NADP+ acts as an electron carrier, becoming NADPH during the light-dependent reactions.
Correct Answer:
B
— Electron carrier
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Q. What is the function of nervous tissue? (2023)
A.
Support
B.
Movement
C.
Transmission of impulses
D.
Protection
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Solution
The function of nervous tissue is the transmission of impulses.
Correct Answer:
C
— Transmission of impulses
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Q. What is the function of oxytocin in the human body? (2023)
A.
Stimulate uterine contractions
B.
Regulate metabolism
C.
Increase blood sugar
D.
Promote sleep
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Solution
Oxytocin is a hormone that stimulates uterine contractions during childbirth and is also involved in social bonding.
Correct Answer:
A
— Stimulate uterine contractions
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Q. What is the function of parathyroid hormone (PTH)? (2022)
A.
Increase calcium levels in the blood
B.
Decrease calcium levels in the blood
C.
Regulate blood sugar
D.
Stimulate red blood cell production
Show solution
Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.
Correct Answer:
A
— Increase calcium levels in the blood
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Q. What is the function of parathyroid hormone? (2022)
A.
Increase calcium levels in the blood
B.
Decrease calcium levels in the blood
C.
Regulate blood sugar
D.
Stimulate growth
Show solution
Solution
Parathyroid hormone increases calcium levels in the blood by promoting the release of calcium from bones and increasing absorption in the intestines.
Correct Answer:
A
— Increase calcium levels in the blood
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Q. What is the function of petals in a flower? (2020)
A.
Support the flower
B.
Attract pollinators
C.
Produce ovules
D.
Store nutrients
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Solution
Petals serve to attract pollinators with their color and scent.
Correct Answer:
B
— Attract pollinators
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Q. What is the function of phloem in plants?
A.
Transport of water
B.
Transport of food
C.
Photosynthesis
D.
Storage of nutrients
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Solution
Phloem is responsible for the transport of food, particularly the sugars produced during photosynthesis, from the leaves to other parts of the plant.
Correct Answer:
B
— Transport of food
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Q. What is the function of phosphorus in plants? (2021)
A.
Energy transfer
B.
Water absorption
C.
Cell wall formation
D.
Photosynthesis
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Solution
Phosphorus is crucial for energy transfer in plants, particularly in the form of ATP (adenosine triphosphate).
Correct Answer:
A
— Energy transfer
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Q. What is the function of plasma in the blood? (2023)
A.
Transport oxygen
B.
Fight infections
C.
Clotting
D.
Transport nutrients and waste
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Solution
Plasma is the liquid component of blood that transports nutrients, hormones, and waste products.
Correct Answer:
D
— Transport nutrients and waste
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Q. What is the function of ribosomes in a cell? (2023)
A.
DNA replication
B.
Protein synthesis
C.
Energy production
D.
Cell division
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Solution
Ribosomes are the cellular structures responsible for protein synthesis.
Correct Answer:
B
— Protein synthesis
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Q. What is the function of ribosomes in the cell? (2019)
A.
Energy production
B.
Protein synthesis
C.
Lipid synthesis
D.
DNA replication
Show solution
Solution
Ribosomes are the sites of protein synthesis, translating messenger RNA into polypeptide chains.
Correct Answer:
B
— Protein synthesis
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Q. What is the function of ribosomes? (2021)
A.
DNA replication
B.
Protein synthesis
C.
Energy production
D.
Cell division
Show solution
Solution
Ribosomes are the cellular structures responsible for protein synthesis.
Correct Answer:
B
— Protein synthesis
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Q. What is the function of sclerenchyma tissue? (2022)
A.
Storage
B.
Photosynthesis
C.
Support and protection
D.
Transport
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Solution
Sclerenchyma tissue provides support and protection to the plant due to its thick, lignified cell walls.
Correct Answer:
C
— Support and protection
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Q. What is the function of stomata in plants? (2019)
A.
Water absorption
B.
Gas exchange
C.
Nutrient uptake
D.
Photosynthesis
Show solution
Solution
Stomata are small openings on leaves that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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