To solve this problem, we need to analyze each statement to determine which one is incorrect. Let's examine each option:$\newline \bullet$Option 1: Sucrose is a disaccharide.$\newline$ - Sucrose is indeed a disaccharide composed of glucose and fructose.$\newline$ - Therefore, this statement is correct.$\newline \bullet$Option 2: Cellulose is a polysaccharide.$\newline$ - Cellulose is a polysaccharide made up of glucose units linked by beta-1,4-glycosidic bonds.$\newline$ - Therefore, this statement is correct.$\newline \bullet$Option 3: Uracil is a pyrimidine.$\newline$ - Uracil is one of the four nucleobases in the nucleic acid of RNA and is indeed a pyrimidine.$\newline$ - Therefore, this statement is correct.$\newline \bullet$Option 4: Glycine is a sulphur containing amino acid.$\newline$ - Glycine is the simplest amino acid with the formula NH$_2$CH$_2$COOH.$\newline$ - It does not contain sulphur; instead, it contains only carbon, hydrogen, nitrogen, and oxygen.$\newline$ - Therefore, this statement is incorrect.$\newline$The incorrect statement is Option 4: Glycine is a sulphur containing amino acid.