Monomers and polymersAQA A-Level Biology: Mind map

Exam questions on Monomers and polymers

1. A student is revising how cells build the large molecules they need. She lists glucose, glycine and a nucleotide containing adenine as small molecules, and starch, a protein and DNA as large molecules made from them.
   Name the type of reaction that joins glycine molecules to form a polypeptide, and state what is released each time two glycine molecules join.2 marks
2. A protease enzyme is added to a solution containing a polypeptide of 120 amino acids. After incubation the solution contains only free amino acids.
   Explain why water is needed for the protease to break down the polypeptide.2 marks
3. Three amino acids, glycine, alanine and serine, are joined in that order to make a tripeptide. The relative formula masses are: glycine 75, alanine 89, serine 105 and water 18.
   Describe how the three amino acids are joined to form the tripeptide.3 marks