BIOMOLECULES AND ENZYMES

Detailed explanation-1: -One millilitre of the analyte sample must be mixed with 2 millilitres of Benedict’s reagent and heated in a bath of boiling water for 3 to 5 minutes. The development of a brick-red coloured precipitate of cuprous oxide confirms the presence of reducing sugars in the analyte.

Detailed explanation-2: -Benedict’s solution is blue but, if simple carbohydrates are present, it will change colour – green/yellow if the amount is low and red if it is high.

Detailed explanation-3: -A positive test with Benedict’s reagent is shown by a color change from clear blue to brick-red with a precipitate. Generally, Benedict’s test detects the presence of aldehydes, alpha-hydroxy-ketones, and hemiacetals, including those that occur in certain ketoses.

Detailed explanation-4: -Benedict’s solution can be used to test for the presence of glucose in urine. Some sugars such as glucose are called reducing sugars because they are capable of transferring hydrogens (electrons) to other compounds, a process called reduction.

Detailed explanation-5: -EXPLANATION: Out of all, Sucrose is the one that doesn’t give a ‘red precipitate’ of Cu2O when heated with ‘Benedict’s solution. Therefore option 1 is correct. Different types of sugar are glucose, Fructose, and maltose and convert the Benedict solution into a red to brick-coloured solution.