Which one of the following statements is wrong?
Correct answer: B. Glycine is a sulfur-containing amino acid
- A. Uracil is a pyrimidine
- B. Glycine is a sulfur-containing amino acid
- C. Sucrose is a disaccharide
- D. Cellulose is a polysaccharide
Explanation
Option A: Uracil is a pyrimidine: This statement is correct. Uracil is one of the four nitrogenous bases found in RNA. It is a pyrimidine base, along with cytosine and thymine. Pyrimidines are a type of organic molecule characterized by a six-membered ring structure.Option B: Glycine is a sulfur-containing amino acid: This statement is incorrect. Glycine is the simplest amino acid and does not contain sulfur. It is the only amino acid that is not chiral and has a hydrogen atom as its side chain. Some amino acids, such as cysteine and methionine, do contain sulfur in their structures.Option C: Sucrose is a disaccharide: This statement is correct. Sucrose is a disaccharide composed of glucose and fructose units joined by a glycosidic bond. It is commonly known as table sugar and is found in various plant sources, including sugarcane and sugar beets.Option D: Cellulose is a polysaccharide: This statement is correct. Cellulose is a polysaccharide and one of the main structural components of plant cell walls. It is composed of long chains of glucose units linked by βglycosidic bonds. Cellulose is indigestible by humans but serves as a valuable dietary fiber
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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