A student makes a model of dialysis. A bag made of partially permeable membrane is filled with a solution of urea and glucose and placed in a beaker of liquid. Urea and glucose molecules can both pass through the membrane.
During the first ten minutes, there is a net movement of urea out of the bag into the liquid in the beaker, but there is no net movement of glucose.
Which statement describes the liquid in the beaker at the start?
a lower urea concentration than the solution in the bag; the same glucose concentration as the solution in the bag
the same urea concentration as the solution in the bag; a lower glucose concentration than the solution in the bag
a higher urea concentration than the solution in the bag; the same glucose concentration as the solution in the bag
a lower urea concentration than the solution in the bag; a lower glucose concentration than the solution in the bag
94 exam-style questions on Edexcel GCSE Biology 7.4 Blood glucose and the urinary system, covering 7.4.1 Insulin and blood glucose control, 7.4.2 Glucagon and blood glucose regulation, 7.4.3 Type 1 and type 2 diabetes, 7.4.4 Structure of the urinary system, 7.4.5 Structure and function of the nephron, 7.4.6 ADH and water regulation, 7.4.7 Treatments for kidney failure, and 7.4.8 Production of urea in the liver. Each one has a worked solution and a mark scheme showing where the marks go.