The art of answering questions without giving away the answer

What is the best way to answer a question with giving the answer? When a student asks a question how do you get them to figure out the answer for his/her self?

Yesterday and today, I helped the students answer questions on worksheets pertaining to transport mechanisms in cells. Some students just wanted the answers but they weren't thinking about what the question was asking them.

My first question is do you understand the question. If the student doesn't understand the question, then I break it down to help them understand what the question was asking. Usually that's enough for the student to figure out the answer. At other times, I have to find ways to point the student in the right direction without giving them the answer; it's difficult.

Abstract concept

I'm starting to prepare for my last presentation which will be on genetic engineering. I'm trying to think of the best way to explain and show DNA replication within cells and how we (humans) manipulate this process in medicine, agriculture, and forensics.