Technical science writing is an art. Unlike English style writing, technical science is clear-cut and lacking in artistic enhancements.
Do not quote your sources but rather read through the information and write it in your own words and cite it. It is a good idea to read an article once all the way through without making any notes. Then come back and read it again this time making notes in the margins or on some scrap paper. This will help ensure you not only understand the material you are reading but that you are able to describe it in your own words and avoid issues of plagiarism which so often become in issue for students.