In the following schematic diagram of a simple columnar epithelium lining the digestive tract, indicate which position (A to F) along the basal-apical axis better corresponds to each of the following features. Your answer would be a six-letter string composed of letters A to F only, e.g. FEDABC.

( ) Basal lamina
( ) Cell apex
( ) Adherens junctions
( ) Gap junctions
( ) Hemidesmosomes
( ) Tight junctions

Selectins …

Cadherin molecules at the cell surface are often clustered side-to-side to create a molecular Velcro that attaches the cell to another cell or to the extracellular matrix. In the following simplified drawings, two cells are initially attached via such a Velcro. When one of the cells moves in either of three different ways (A to C), it is faced with a mechanical resistance from the cadherin interactions. The resistance against which type of movement do you think is the weakest? Write down A, B, or C as your answer.