0654 Biological Molecules Quiz

Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?

When a substance is added to meat, amino acids are produced. What is this substance?

The diagram shows part of a protein molecule. What does X represent?

Four different foods were tested for their composition. The results are shown in the table. Which food contains protein but not reducing sugar or starch?

What are the smaller basic units of starch and glycogen molecules?

The diagram represents a protein molecule. What do the small circles represent?

Which row shows the elements and basic units that are used in the construction of large food molecules

Which nutrient produces a purple colour when mixed with biuret solution?

Which food-testing reagent shows a positive result when it turns from blue to purple?

The diagram shows two food tests carried out on solution X. Which nutrients are present in solution X?

The data show the concentrations of sugar and starch in an onion. The onion is tested with Benedict’s solution and iodine solution. Which set of results is correct?

A human cell contains a length of DNA that carries the code for making which substance?

A student set up a test-tube containing starch, water and amylase. How could the student test whether the amylase had digested all the starch?

When solution X is tested with iodine solution, a blue-black colour is observed. A different solution, Y, is added to a new sample of solution X and the mixture is shaken and left for 30 minutes at 40 °C. When tested with iodine solution, an orange-brown colour is observed. What are solutions X and Y?

Which row correctly identifies the chemical elements found in proteins?

The top diagram shows part of a starch molecule. Which diagram shows this molecule after it has been completely digested?

Four foods were tested for: * fat (using ethanol), * protein (using the biuret test), * reducing sugar (using Benedict’s solution), * starch (using iodine solution). Which food contains protein and starch?

Which elements do carbohydrates contain?

What does the digestion of starch produce?

The diagram shows part of a starch molecule. Which diagram shows this molecule after it has been completely digested?