Question

Below is a form of chromatin often referred to as "beads on a string." Use this image to answer the questions. Approximately 146 bp of DNA is wrapped around the nucleosome core particle. Therefore 200 bp - 146 bp = 54 bp of linker DNA. This is the amount of DNA present in the "string." Referring to the image, there appears to be a span of 13 "beads" present. Ignoring the DNA before the first bead and after the 13th bead, how much DNA is present in the photo?

Answer 1

number of base pair wraped in 13 beads = 13 x 146 =1898 bp

number of linking DNA between 1st and 13th beads =12, so number of base pair in linking DNA between 1st and 13th beads= 12 x 54 =648 bp

total DNA present= 1898 bp + 648 bp =2546 bp