1. What is the primary function of enzymes in biological systems?
- Energy storage
- Cell structure
- Catalyzing chemical reactions
- DNA replication
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Answer: Catalyzing chemical reactions
Enzymes are biological catalysts that speed up chemical reactions in living organisms.
2. Which of the following is a monosaccharide?
- Sucrose
- Glucose
- Lactose
- Maltose
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Answer: Glucose
Glucose is a simple sugar and a monosaccharide.
3. What is the main function of DNA?
- Energy storage
- Protein synthesis
- Cell structure
- ATP production
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Answer: Protein synthesis
DNA carries the genetic information needed for protein synthesis.
4. Which of the following is a function of lipids in the human body?
- Quick energy storage
- Insulation
- Structural support
- Enzyme production
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Answer: Insulation
Lipids function in insulation and act as a long-term energy storage.
5. What type of biomolecule is insulin?
- Carbohydrate
- Lipid
- Protein
- Nucleic acid
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Answer: Protein
Insulin is a protein hormone that regulates blood sugar levels.
6. Which of the following is NOT a component of a nucleotide?
- Phosphate group
- Deoxyribose sugar
- Amino group
- Nitrogenous base
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Answer: Amino group
Nucleotides consist of a phosphate group, a sugar, and a nitrogenous base.
7. What is the primary function of RNA?
- Energy storage
- Genetic information storage
- Catalyzing reactions
- Protein synthesis
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Answer: Protein synthesis
RNA plays a key role in protein synthesis.
8. Which of the following is a disaccharide?
- Glucose
- Fructose
- Sucrose
- Maltose
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Answer: Sucrose
Sucrose is a disaccharide composed of glucose and fructose.
9. What is the building block of proteins?
- Nucleotide
- Amino acid
- Fatty acid
- Monosaccharide
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Answer: Amino acid
Proteins are made up of amino acid chains.
10. Which organelle is responsible for cellular respiration?
- Nucleus
- Mitochondrion
- Endoplasmic reticulum
- Golgi apparatus
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Answer: Mitochondrion
Mitochondria are the powerhouse of the cell and are involved in cellular respiration.
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