Q. What is the structure of DNA?
A.
Single-stranded
B.
Double helix
C.
Triple helix
D.
Linear
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Solution
DNA has a double helix structure, consisting of two strands that coil around each other.
Correct Answer: B — Double helix
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Q. What role do enzymes play in biological systems?
A.
They provide structural support
B.
They act as catalysts for biochemical reactions
C.
They store genetic information
D.
They transport molecules across membranes
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Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — They act as catalysts for biochemical reactions
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Q. What type of biomolecule are enzymes classified as?
A.
Carbohydrates
B.
Proteins
C.
Lipids
D.
Nucleic acids
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Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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Q. What type of biomolecule is insulin?
A.
Carbohydrate
B.
Lipid
C.
Protein
D.
Nucleic acid
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Solution
Insulin is a protein hormone that regulates glucose levels in the blood.
Correct Answer: C — Protein
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Q. What type of bond forms between the carboxyl group of one amino acid and the amino group of another?
A.
Hydrogen bond
B.
Ionic bond
C.
Peptide bond
D.
Disulfide bond
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Solution
A peptide bond forms between the carboxyl group of one amino acid and the amino group of another, linking them together in a protein.
Correct Answer: C — Peptide bond
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Q. What type of bond is formed between amino acids in a protein?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Van der Waals forces
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Solution
A covalent bond, specifically a peptide bond, is formed between amino acids in a protein.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed between the amino group of one amino acid and the carboxyl group of another?
A.
Ionic bond
B.
Hydrogen bond
C.
Peptide bond
D.
Covalent bond
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Solution
A peptide bond is formed between the amino group of one amino acid and the carboxyl group of another.
Correct Answer: C — Peptide bond
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Q. What type of bond is primarily responsible for the secondary structure of proteins?
A.
Ionic bonds
B.
Hydrogen bonds
C.
Covalent bonds
D.
Disulfide bonds
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Solution
Hydrogen bonds are primarily responsible for the formation of secondary structures like alpha-helices and beta-pleated sheets in proteins.
Correct Answer: B — Hydrogen bonds
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Q. What type of bond links amino acids in proteins?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Van der Waals forces
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Solution
Amino acids are linked by peptide bonds, which are a type of covalent bond.
Correct Answer: B — Covalent bond
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Q. What type of bond links amino acids together in a protein?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Peptide bond
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Solution
A peptide bond is a specific type of covalent bond that links amino acids together in proteins.
Correct Answer: D — Peptide bond
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Q. What type of bond links amino acids together in proteins?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Van der Waals forces
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Solution
Amino acids are linked by peptide bonds, which are a type of covalent bond.
Correct Answer: B — Covalent bond
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Q. What type of bond links monosaccharides in a disaccharide?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Van der Waals bond
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Solution
Monosaccharides in a disaccharide are linked by a covalent bond known as a glycosidic bond.
Correct Answer: B — Covalent bond
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Q. What type of bond links monosaccharides in polysaccharides?
A.
Ionic bond
B.
Covalent bond
C.
Hydrogen bond
D.
Van der Waals forces
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Solution
Monosaccharides are linked by glycosidic bonds, which are a type of covalent bond.
Correct Answer: B — Covalent bond
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Q. What type of carbohydrate is glucose?
A.
Disaccharide
B.
Monosaccharide
C.
Polysaccharide
D.
Oligosaccharide
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Solution
Glucose is a monosaccharide, which is the simplest form of carbohydrates.
Correct Answer: B — Monosaccharide
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Q. What type of carbohydrate is starch?
A.
Monosaccharide
B.
Disaccharide
C.
Oligosaccharide
D.
Polysaccharide
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Solution
Starch is classified as a polysaccharide, consisting of many glucose units.
Correct Answer: D — Polysaccharide
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Q. What type of carbohydrate is sucrose?
A.
Monosaccharide
B.
Disaccharide
C.
Oligosaccharide
D.
Polysaccharide
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Solution
Sucrose is a disaccharide composed of glucose and fructose.
Correct Answer: B — Disaccharide
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Q. What type of interaction is crucial for the tertiary structure of proteins?
A.
Hydrophobic interactions
B.
Covalent bonds
C.
Ionic interactions
D.
All of the above
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Solution
The tertiary structure of proteins is stabilized by a combination of hydrophobic interactions, ionic interactions, hydrogen bonds, and sometimes covalent bonds.
Correct Answer: D — All of the above
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Q. What type of interaction stabilizes the tertiary structure of proteins?
A.
Hydrophobic interactions
B.
Covalent bonds
C.
Ionic interactions
D.
All of the above
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Solution
The tertiary structure of proteins is stabilized by a combination of hydrophobic interactions, ionic interactions, hydrogen bonds, and sometimes covalent bonds.
Correct Answer: D — All of the above
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Q. What type of protein is hemoglobin?
A.
Enzyme
B.
Structural protein
C.
Transport protein
D.
Hormonal protein
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Solution
Hemoglobin is a transport protein that carries oxygen in the blood.
Correct Answer: C — Transport protein
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Q. What type of protein structure involves multiple polypeptide chains?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
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Solution
The quaternary structure of a protein is formed when two or more polypeptide chains assemble into a functional protein complex.
Correct Answer: D — Quaternary structure
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Q. What type of reaction forms a peptide bond?
A.
Hydrolysis
B.
Condensation
C.
Oxidation
D.
Reduction
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Solution
A peptide bond is formed through a condensation reaction, where water is released.
Correct Answer: B — Condensation
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Q. What type of reaction forms peptide bonds between amino acids?
A.
Hydrolysis
B.
Condensation
C.
Redox
D.
Substitution
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Solution
Peptide bonds are formed through a condensation reaction, where a molecule of water is released.
Correct Answer: B — Condensation
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Q. What type of reaction forms peptide bonds?
A.
Hydrolysis
B.
Condensation
C.
Oxidation
D.
Reduction
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Solution
Peptide bonds are formed through a condensation reaction between amino acids.
Correct Answer: B — Condensation
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Q. What type of reaction forms polymers from monomers?
A.
Hydrolysis
B.
Dehydration synthesis
C.
Redox reaction
D.
Condensation reaction
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Solution
Dehydration synthesis is the reaction that links monomers together to form polymers by removing water.
Correct Answer: B — Dehydration synthesis
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Q. What type of reaction occurs when two amino acids form a peptide bond?
A.
Hydrolysis
B.
Condensation
C.
Redox
D.
Substitution
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Solution
The formation of a peptide bond between two amino acids is a condensation reaction, releasing water.
Correct Answer: B — Condensation
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Q. Which biomolecule carries genetic information?
A.
Proteins
B.
Carbohydrates
C.
Lipids
D.
Nucleic acids
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Solution
Nucleic acids, such as DNA and RNA, are responsible for carrying genetic information.
Correct Answer: D — Nucleic acids
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Q. Which biomolecule is primarily involved in cell membrane structure?
A.
Carbohydrates
B.
Proteins
C.
Nucleic acids
D.
Lipids
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Solution
Lipids, particularly phospholipids, are the main components of cell membranes.
Correct Answer: D — Lipids
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Q. Which biomolecule is primarily involved in energy transfer within cells?
A.
DNA
B.
RNA
C.
ATP
D.
Proteins
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Solution
ATP (adenosine triphosphate) is the primary energy carrier in cells.
Correct Answer: C — ATP
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Q. Which biomolecule is primarily involved in genetic information storage?
A.
Proteins
B.
Carbohydrates
C.
Lipids
D.
Nucleic acids
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Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which biomolecule is primarily responsible for energy storage in animals?
A.
Proteins
B.
Carbohydrates
C.
Lipids
D.
Nucleic acids
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Solution
Lipids, particularly triglycerides, are the main form of energy storage in animals.
Correct Answer: C — Lipids
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