{"type":"video","version":"1.0","html":"<iframe src=\"https://www.loom.com/embed/f3059499ce7b45339c692fd909c3ce8f\" frameborder=\"0\" width=\"1096\" height=\"822\" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>","height":822,"width":1096,"provider_name":"Loom","provider_url":"https://www.loom.com","thumbnail_height":822,"thumbnail_width":1096,"thumbnail_url":"https://cdn.loom.com/sessions/thumbnails/f3059499ce7b45339c692fd909c3ce8f-00001.jpg","duration":136,"title":"SAT official #1_S1_Q22","description":"p:  The authors use the word “backbone” in lines 3 and 39 to indicate that \na:  only very long chains of DNA can be taken from an organism with a spinal column. ;\n the main structure of a chain in a DNA molecule is composed of repeating units. ;\n a chain in a DNA molecule consists entirely of phosphate groups or of sugars. ;\n nitrogenous bases form the main structural unit of DNA. ;"}