Question

glucose levels. when glucose levels increase, cells in the pancreas release insulin. insulin binds specifically to receptors on the outside of cells in the liver and other parts of the body. this causes those cells to take in glucose, which lowers blood sugar levels. select the true statement. hormones speed up chemical reactions. insulin transports glucose into a cell. insulins shape allows it to bind to specific parts of a cell. submit

Explanation:

Enzymes speed up chemical reactions, not hormones. Insulin binds to receptors (specific parts of cells) which then causes cells to take in glucose, but insulin itself does not transport glucose into the cell. The text states "Insulin binds specifically to receptors on the outside of cells", which implies that insulin's shape (as molecules' ability to bind is related to their shape - like a lock - and - key mechanism) allows it to bind to specific parts (receptors) of a cell.

Answer:

Insulin's shape allows it to bind to specific parts of a cell.