Which of these molecules contains glucose?

Question

Which of these molecules contains glucose??  
A. Proteins  
B. Lipids  
C. Nucleic acids  
D. Carbohydrates

Accepted Answer

Correct Answer: (D)Carbohydrates. 
Rationale: Carbohydrates contain glucose.Glucose is a simple sugar (a monosaccharide) that serves as a fundamental building block for many larger biological molecules. It is the primary source of energy for cells and is commonly linked together to form more complex sugars and storage molecules. Any group of molecules that is defined by being built from sugars, especially glucose, belongs to the carbohydrate category.A) ProteinsProteins are made of long chains of amino acids joined by peptide bonds. Their structure and function depend on the sequence and folding of these amino acids. Although proteins may interact with glucose in the body (for example, enzymes that metabolize glucose), glucose is not a structural component of proteins. Therefore, proteins do not contain glucose.B) LipidsLipids include fats, oils, waxes, phospholipids, and steroids. They are primarily composed of fatty acids and glycerol. Lipids are hydrophobic molecules and are not built from sugar units. While special molecules called glycolipids contain small carbohydrate groups, lipids as a general class do not contain glucose as a core structural unit. This makes this option incorrect.C) Nucleic acidsNucleic acids, such as DNA and RNA, are composed of nucleotides. Each nucleotide contains a phosphate group, a nitrogenous base, and a sugar. However, the sugar in DNA is deoxyribose and in RNA is ribose. Both are five-carbon sugars, not glucose, which is a six-carbon sugar. Therefore, nucleic acids do not contain glucose.D) CarbohydratesCarbohydrates are molecules made of carbon, hydrogen, and oxygen, and they are built from sugar units. Glucose itself is a carbohydrate and is the most common monosaccharide in biology. Many important carbohydrates are made from glucose, including:Disaccharides such as sucrose, lactose, and maltosePolysaccharides such as starch (plants), glycogen (animals), and cellulose (plant cell walls)Because glucose is the basic unit of these molecules, carbohydrates are the correct answer.ConclusionGlucose is a simple sugar and serves as the building block for many larger biological molecules classified as carbohydrates. Proteins, lipids, and nucleic acids are built from different types of subunits. Therefore, the correct answer is D) Carbohydrates.

Which of these molecules contains glucose?

A
Proteins

B
Lipids

C
Nucleic acids

D
Carbohydrates

Carbohydrates contain glucose.

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Which of these molecules contains glucose?

A Proteins B Lipids C Nucleic acids D Carbohydrates

Carbohydrates contain glucose.

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Related Questions

A
Proteins

B
Lipids

C
Nucleic acids

D
Carbohydrates