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 main function of dietary fiber in nutrition?
A.
Energy production
B.
Regulating blood sugar
C.
Promoting digestion
D.
Building muscle
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Solution
Dietary fiber promotes digestion by aiding in the movement of food through the digestive tract.
Correct Answer: C — Promoting digestion
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Q. What is the main function of the digestive system?
A.
To provide energy
B.
To absorb nutrients
C.
To circulate blood
D.
To regulate temperature
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Solution
The digestive system breaks down food into nutrients, which are then absorbed into the bloodstream for energy.
Correct Answer: B — To absorb nutrients
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Q. What is the main product of photosynthesis?
A.
Oxygen
B.
Glucose
C.
Carbon dioxide
D.
Water
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Solution
The main product of photosynthesis is glucose, which serves as an energy source for the plant.
Correct Answer: B — Glucose
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Q. What is the primary component of the cell wall in plant cells?
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The cell wall of plant cells is primarily made of cellulose, providing structural support.
Correct Answer: A — Cellulose
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Q. What is the primary function of fats in the diet?
A.
Energy storage
B.
Muscle building
C.
Bone health
D.
Immune function
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Solution
Fats primarily serve as energy storage, providing 9 calories per gram.
Correct Answer: A — Energy storage
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Q. What is the primary function of the cell membrane?
A.
To provide energy to the cell
B.
To control the movement of substances in and out of the cell
C.
To store genetic information
D.
To synthesize proteins
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Solution
The cell membrane regulates what enters and exits the cell, maintaining homeostasis.
Correct Answer: B — To control the movement of substances in and out of the cell
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Q. What is the primary function of the circulatory system in the human body?
A.
To digest food
B.
To transport nutrients and oxygen
C.
To regulate body temperature
D.
To produce hormones
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Solution
The circulatory system is responsible for transporting nutrients, oxygen, and waste products throughout the body.
Correct Answer: B — To transport nutrients and oxygen
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Q. What is the primary function of the mitochondria? (2020)
A.
Photosynthesis
B.
Cellular respiration
C.
Protein synthesis
D.
DNA replication
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Solution
Mitochondria are known as the powerhouse of the cell, where cellular respiration occurs to produce ATP.
Correct Answer: B — Cellular respiration
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Q. What is the primary function of the ribosomes in a cell? (2021)
A.
Energy production
B.
Protein synthesis
C.
DNA replication
D.
Cell division
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Solution
Ribosomes are the cellular structures responsible for synthesizing proteins by translating messenger RNA (mRNA).
Correct Answer: B — Protein synthesis
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Q. What is the primary source of energy in a balanced diet?
A.
Proteins
B.
Carbohydrates
C.
Fats
D.
Vitamins
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Solution
Carbohydrates are the primary source of energy in a balanced diet, providing 4 calories per gram.
Correct Answer: B — Carbohydrates
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Q. What is the probability of a person being diagnosed with a disease if the prevalence of the disease in a population is 2% and the test for the disease has a sensitivity of 90% and a specificity of 95%? (2021)
A.
0.018
B.
0.020
C.
0.090
D.
0.095
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Solution
Using Bayes' theorem, P(Disease|Positive) = (P(Positive|Disease) * P(Disease)) / P(Positive). Here, P(Positive) = P(Positive|Disease) * P(Disease) + P(Positive|No Disease) * P(No Disease). Calculating gives approximately 0.018.
Correct Answer: A — 0.018
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Q. What is the probability of a person being infected with a disease if the prevalence of the disease in a population is 2%? (2021)
A.
0.02
B.
0.5
C.
0.1
D.
0.03
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Solution
The prevalence of the disease is given as 2%, which can be expressed as a probability of 0.02.
Correct Answer: A — 0.02
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Q. What is the recommended daily intake of fruits and vegetables for a healthy diet?
A.
1-2 servings
B.
3-5 servings
C.
5-7 servings
D.
7-10 servings
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Solution
The recommended daily intake is 5-7 servings of fruits and vegetables for optimal health.
Correct Answer: B — 3-5 servings
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Q. What is the role of auxins in plant growth?
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit growth
D.
Promote cell elongation
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Solution
Auxins are plant hormones that promote cell elongation, which is crucial for growth and development in plants.
Correct Answer: D — Promote cell elongation
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Q. What is the role of enzymes in biological reactions? (2023)
A.
Increase temperature
B.
Decrease activation energy
C.
Change the pH
D.
Provide energy
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Solution
Enzymes act as catalysts that lower the activation energy required for biochemical reactions, thus speeding them up.
Correct Answer: B — Decrease activation energy
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Q. What is the role of ribosomes in a cell?
A.
Energy production
B.
Protein synthesis
C.
DNA replication
D.
Cell division
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Solution
Ribosomes are the sites of protein synthesis, translating mRNA into polypeptide chains.
Correct Answer: B — Protein synthesis
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Q. What is the role of the respiratory system?
A.
To break down food
B.
To exchange gases
C.
To circulate blood
D.
To protect against pathogens
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Solution
The respiratory system is responsible for the exchange of gases, primarily oxygen and carbon dioxide, between the body and the environment.
Correct Answer: B — To exchange gases
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Q. What structure is selectively permeable and surrounds the cell?
A.
Cell wall
B.
Cytoplasm
C.
Cell membrane
D.
Nucleus
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Solution
The cell membrane is selectively permeable, allowing certain substances to pass while blocking others.
Correct Answer: C — Cell membrane
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Q. Which mineral is crucial for oxygen transport in the blood?
A.
Calcium
B.
Iron
C.
Zinc
D.
Magnesium
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Solution
Iron is crucial for oxygen transport as it is a key component of hemoglobin in red blood cells.
Correct Answer: B — Iron
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Q. Which nutrient is primarily responsible for muscle repair and growth?
A.
Carbohydrates
B.
Fats
C.
Proteins
D.
Minerals
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Solution
Proteins are essential for muscle repair and growth due to their role in building and repairing tissues.
Correct Answer: C — Proteins
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Q. Which of the following is a complete protein source?
A.
Rice
B.
Beans
C.
Eggs
D.
Peanuts
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Solution
Eggs are considered a complete protein source as they contain all essential amino acids.
Correct Answer: C — Eggs
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Q. Which of the following is a function of the cell membrane? (2022)
A.
Energy production
B.
Regulating entry and exit of substances
C.
Protein synthesis
D.
Photosynthesis
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Solution
The cell membrane regulates the entry and exit of substances, maintaining homeostasis within the cell.
Correct Answer: B — Regulating entry and exit of substances
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Q. Which of the following is NOT a function of the smooth endoplasmic reticulum?
A.
Lipid synthesis
B.
Detoxification of drugs
C.
Protein synthesis
D.
Calcium ion storage
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Solution
The smooth endoplasmic reticulum is involved in lipid synthesis, detoxification, and calcium storage, but not protein synthesis.
Correct Answer: C — Protein synthesis
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Q. Which of the following is NOT a macromolecule? (2021)
A.
Proteins
B.
Carbohydrates
C.
Lipids
D.
Water
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Solution
Water is a small molecule and not classified as a macromolecule, while proteins, carbohydrates, and lipids are.
Correct Answer: D — Water
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Q. Which of the following processes occurs in the nucleus of a cell? (2023)
A.
Photosynthesis
B.
Cell respiration
C.
DNA replication
D.
Protein synthesis
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Solution
DNA replication occurs in the nucleus, where the cell's genetic material is housed.
Correct Answer: C — DNA replication
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Q. Which of the following structures is involved in the synthesis of ribosomal RNA?
A.
Nucleus
B.
Ribosome
C.
Golgi apparatus
D.
Endoplasmic reticulum
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Solution
The nucleolus, located within the nucleus, is responsible for synthesizing ribosomal RNA.
Correct Answer: A — Nucleus
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Q. Which organ is primarily responsible for filtering blood in the human body?
A.
Liver
B.
Heart
C.
Kidneys
D.
Lungs
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Solution
The kidneys filter blood to remove waste and excess substances, producing urine.
Correct Answer: C — Kidneys
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Q. Which organ is responsible for the production of insulin?
A.
Liver
B.
Pancreas
C.
Kidneys
D.
Stomach
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Solution
The pancreas produces insulin, which helps regulate blood sugar levels in the body.
Correct Answer: B — Pancreas
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Q. Which organelle is involved in the synthesis of ribosomal RNA?
A.
Nucleus
B.
Nucleolus
C.
Rough endoplasmic reticulum
D.
Golgi apparatus
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Solution
The nucleolus is responsible for synthesizing ribosomal RNA (rRNA) and assembling ribosomes.
Correct Answer: B — Nucleolus
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