Molecular biology was definitely the central player of the life sciences in the 20th century. At the end of the nineteenth century, Mendel explained the genetic phenomena. Avery determined that the gene was DNA. Watson and Click came to discover the double helix structure of DNA. Then, main theme of the life science in the second half of the 20th century was directed to "Exploring cells ". Basic Molecular Biology 1 to 4 will acquire knowledge of molecular cell biology indispensable for grasping modern life science. Instead of passively listening to lectures, classes focus on exercises that actively solve problems. Basic Molecular Biology X will be the first part of it.