They aren't! Technically the aren't even essays, just a free response question. They do not need a fancy, flowery introduction or any thing similar to that. All the questions ask you to do is to answer the question. They do not require you to get the reader's attention or even ask your opinion. The graders only look to see if the question was answered properly. However, use of examples, real connections and organized answers can influence how they grade your work. Be short, responsive and know what you're talking about. They essays can make or break you, so know your stuff, and you'll be just fine.