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Chapter 9: Problem 10

Make a side-by-side drawing of two DNA helices: one with \(10 \mathrm{bp}\) per \(360^{\circ}\) turn and the other with 15 bp per \(360^{\circ}\) turn.

Short Answer

Expert verified
Two DNA helices were drawn side by side: one with 10 base pairs per turn and another with 15 base pairs per turn. The helix with 10 base pairs per turn was noticeably more tightly coiled than the one with 15 base pairs per turn.

Step by step solution

01

Draw the first DNA helix

Begin by drawing the first DNA helix that completes a full turn every 10 base pairs. Use a circle as a guide to maintain the roundness of the helix. Inside the circle, draw a spiral line that represents the DNA helix. Divide the circle into 10 equal segments to represent the 10 base pairs. Connect the ends of these segments to the helix line and display each connection as a base pair.
02

Draw the second DNA helix

Next, draw the second DNA helix, which completes a full turn every 15 base pairs, right next to the first helix. Use a circle of the same size as in step 1 to maintain proportionality. Draw a spiral within the circle and divide the circle into 15 equal segments. Each segment represents a base pair. Now, connect again the ends of these segments to the helix line.
03

Compare the DNA helices

Now that both drawings are complete, observe the differences between them. The most noticeable difference is the number of base pairs per turn. The first DNA helix with 10 bp per turn has a tighter coil than the second one with 15 bp per turn. These differences reflect how DNA helices can vary in nature.

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Most popular questions from this chapter

Within a protein, certain amino acids are positively charged (e.g., lysine and arginine), some are negatively charged (e.g., glutamate and aspartate), some are polar but uncharged, and some are nonpolar. If you knew that a DNA-binding protein was recognizing the DNA backbone rather than a base sequence, which amino acids in the protein would be good candidates for interacting with the DNA?

An organism has a \(\mathrm{G}+\mathrm{C}\) content of \(64 \%\) in its DNA. What are the percentages of \(A, T, G\), and \(C\) ?

What structural feature allows DNA to store information?

Could single-stranded DNA form a stem-loop structure? Why or why not?

List the structural differences between DNA and RNA.
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