Question 1
Insulin is a protein produced in beta cells in the pancreas.
Ribosomes are involved in the production of insulin.
The photographs show part of a beta cell from the pancreas, as seen using an electron microscope.
(Source: © Don Fawcett/Science Photo Library
© Martin M. Rotker/Science Photo Library)
The structures labelled T and U are the same type of organelle.
Suggest why these structures look different in this photograph.