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Chapter 24: Q26P (page 876)

Calculate the length of the 50,000 - bpDNA in a 30 - nmfiber.

Short Answer

Expert verified

The DNA in 30 - nm fibre has a length of 405 - nm .

Step by step solution

01

Calculation of contour length.

DNA coils around nucleosome residues during chromatin synthesis. By folding in a zigzag pattern, chromatin condenses even more to a 30 - nm diameter helical fibre.

The contour length must be calculated as follows:

50,000-bp脳3.4A=170,000A

02

Determine the length of the DNA.

The initial coiling of the DNA around the histone cuts the length in half, and the creation of the 30 - nm fibre cuts the length in half again. As a result, the packing ratio of the 30 - nm fibre is as follows:7脳6=42.

The DNA in 30 - nm fibre has the following length:

170,00042=4047Awhich is equal to 405 - nm.

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Most popular questions from this chapter

Describe the forces that stabilize nucleic acid structure. Which is more important?

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Calculate the contour length for the gene in in Problem 3 if it assumed an A-DNA conformation.
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