Biology 9700 · AS & A Level · Testing for biological molecules

Testing for biological molecules — practice question

The flow chart indicates the outcomes of several tests carried out on a solution containing biochemicals. Benedict’s test: blue; non-reducing sugar test: yellow; iodine test: blue-black; biuret test: purple. Which substances are present in the solution?

  • Aamylose, amylopectin and lipid
  • Bglucose, starch and catalase
  • Csucrose, amylase and triglyceride
  • Dsucrose, starch and catalase

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI