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

When bases pair up in the formation of DNA, what is one of the pairings?

Four foods were tested for each of the following nutrients: fat (using ethanol); protein (using the biuret test); reducing sugar (using Benedict’s solution), Which food contains protein and fat?

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

An amino acid is deaminated. This is the removal of

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

The structures of antibodies, DNA molecules and enzymes are specific to their actions. Which feature of each molecule makes it specific?

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

The diagram shows two food molecules before and after they have been digested by enzymes. What identifies the products of fat digestion?

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

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?

Which simple molecules are the basic units of protein?

The diagram shows a section of DNA, with four bases identified on one strand. Which sequence of bases would be on the other strand, starting from the top?

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

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

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

Which of these is digested by protease?

The diagram shows the order of bases along part of one strand of DNA. A―C―T―T―A―G―A―T What is the order of bases on the corresponding part of the other strand?

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