Question

question 3
which reaction builds a polymer?
hydrolysis
dehydration
question 4
what is this molecule?

Explanation:

For Question 3, dehydration reactions link monomers together to form polymers by removing a water molecule. Hydrolysis is the opposite, breaking polymers into monomers. For Question 4, the given molecular structure has a characteristic four - ring structure typical of steroids.

Answer:

Question 3: B. dehydration
Question 4: steroid