It is a less invasive surgery, so your recovery time is shorter and easier than with mastectomy. Lumpectomy has a few potential disadvantages: You are likely to have 5 to 7 weeks of radiation therapy, 5 days per week, after lumpectomy surgery to make sure the cancer is gone.
DNA: Double Helix. The secondary structure of DNA is actually very similar to the secondary structure of proteins. The protein single alpha helix structure held together by hydrogen bonds was discovered with the aid of X-ray diffraction studies. The X-ray diffraction patterns for DNA show somewhat similar patterns.
Alpha Helices. Alpha helices are the most common form of secondary structure in proteins. They are created by right-handed coiling of the primary protein structure. The coiling is caused by hydrogen bond interactions between the amino acids within the protein. Alpha helices are often found in DNA binding motifs.