# Basic methods

- [Competent cell preparation](/protocol/biology/basic-experiments/basic-methods/competent-cell-preparation.md): Rubidium chloride를 사용한 형질전환용 박테리아 제작
- [General PCR](/protocol/biology/basic-experiments/basic-methods/general-pcr.md): 가장 기본적이면서도 어려운 실험
- [Overlap extension PCR](/protocol/biology/basic-experiments/basic-methods/overlap-extension-pcr.md): 짧은 fragment끼리 빠르게 연결해서 긴 fragment로 만드는 방법
- [Gel purification](/protocol/biology/basic-experiments/basic-methods/gel-purification.md): DNA fragment를 size selection하기 위한 방법