#1
Which of the following is a monosaccharide?
Glucose
ExplanationMonosaccharides are single sugar molecules, and glucose is a prime example.
#2
What is the primary function of lipids in biological systems?
Energy storage
ExplanationLipids, such as fats, serve as a concentrated and efficient energy storage source in organisms.
#3
Which of the following carbohydrates is a polysaccharide?
Glycogen
ExplanationPolysaccharides, like glycogen, consist of multiple sugar units and serve as energy storage in organisms.
#4
What is the structure of a nucleotide?
Phosphate group + nitrogenous base
ExplanationNucleotides, the building blocks of nucleic acids, consist of a phosphate group and a nitrogenous base.
#5
Which of the following is a disaccharide?
Sucrose
ExplanationDisaccharides, like sucrose, consist of two sugar units linked together.
#6
Which of the following is a function of proteins?
Catalyzing biochemical reactions
ExplanationProteins act as catalysts, facilitating and speeding up biochemical reactions in cells.
#7
Which level of protein structure involves interactions between side chains of amino acids?
Tertiary
ExplanationTertiary structure of proteins is determined by the three-dimensional folding and interactions of amino acid side chains.
#8
Which of the following is not a type of lipid?
Glycogen
ExplanationGlycogen is a polysaccharide, not a lipid. Lipids include fats, phospholipids, and steroids.
#9
What is the primary structure of a protein?
Sequence of amino acids
ExplanationThe primary structure of a protein is the linear sequence of amino acids in its polypeptide chain.
#10
Which of the following is a function of carbohydrates?
Energy storage
ExplanationCarbohydrates, including polysaccharides, play a role in storing and providing energy.
#11
Which of the following nucleic acids carries instructions for protein synthesis?
DNA
ExplanationDNA, or deoxyribonucleic acid, contains genetic instructions used in the synthesis of proteins.
#12
Which of the following is a purine nitrogenous base found in DNA?
Adenine
ExplanationAdenine is a purine base and one of the building blocks of DNA.
#13
Which of the following nitrogenous bases is found in RNA but not in DNA?
Uracil
ExplanationUracil is a unique nitrogenous base found in RNA but not in DNA.
#14
What is the quaternary structure of a protein?
Assembly of multiple polypeptide chains
ExplanationQuaternary structure involves the arrangement of multiple polypeptide chains in a protein.
#15
Which of the following is a function of phospholipids?
Forming cell membranes
ExplanationPhospholipids contribute to the formation of cell membranes in biological systems.