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Biological Molecules and Their Structures Quiz

#1

Which of the following is a monosaccharide?

Glucose
Explanation

Monosaccharides are single sugar molecules, and glucose is a prime example.

#2

What is the primary function of lipids in biological systems?

Energy storage
Explanation

Lipids, such as fats, serve as a concentrated and efficient energy storage source in organisms.

#3

Which of the following carbohydrates is a polysaccharide?

Glycogen
Explanation

Polysaccharides, 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
Explanation

Nucleotides, the building blocks of nucleic acids, consist of a phosphate group and a nitrogenous base.

#5

Which of the following is a disaccharide?

Sucrose
Explanation

Disaccharides, like sucrose, consist of two sugar units linked together.

#6

Which of the following is a function of proteins?

Catalyzing biochemical reactions
Explanation

Proteins 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
Explanation

Tertiary 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
Explanation

Glycogen 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
Explanation

The 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
Explanation

Carbohydrates, including polysaccharides, play a role in storing and providing energy.

#11

Which of the following nucleic acids carries instructions for protein synthesis?

DNA
Explanation

DNA, 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
Explanation

Adenine 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
Explanation

Uracil 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
Explanation

Quaternary structure involves the arrangement of multiple polypeptide chains in a protein.

#15

Which of the following is a function of phospholipids?

Forming cell membranes
Explanation

Phospholipids contribute to the formation of cell membranes in biological systems.

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