Question

PLEASE HELP ME!! I WILL FAN AND MEDAL:)

Answer 1

Procedure:
A typical cardboard tube has a seam that, when viewed from one end, describes a spiral that moves away from the observer. This spiral is called a helix. Outline the spiral seam with a colored marker.
Using a different colored marker, draw a second spiral midway between the lines of the first one. These two spirals represent the two strands of double-stranded DNA.
Measure along the tube and mark a dot on each spiral every five cm. Label a dot with the letter S to indicate a sugar unit. Make a hole in the spirals at each S mark with the thumbtack. Move down each spiral and mark a letter P to indicate a phosphate group halfway between the two S dots.
Color each toothpick along half its length with a marker. A toothpick represents a base pair in the DNA molecule.
Starting at the top of the tube, insert a toothpick in one hole at an S label and guide it so it emerges through the hole in the S on the opposite side of the tube. Repeat the process for the other holes.

Questions:
Are the bases on the interior or the exterior of the double helix? Are they randomly arranged or neatly stacked?
Are the phosphate groups on the interior or the exterior of the DNA molecule?
Are the sugar groups on the interior or the exterior of the DNA molecule?

Answer 2

In the Watson-Crick model, the bases are in the interior of the helix aligned at a nearly 90 degree angle relative to the axis of the helix. http://themedicalbiochemistrypage.org/nucleic-acids.php

Answer 3

@JoannaBlackwelder Can you help me with the questions??

Answer 4

Well, from the info I just gave you, can you figure out one of the questions?

Answer 5

The hydrophilic backbone of alternating deoxyribose and phosphate groups are on the exterior of the double helix facing the surrounding aqueous media.

http://www.ukessays.com/essays/biology/structure-and-functions-of-dna-and-rna-biology-essay.php#ixzz3Y9g9Rt86

Answer 6

No, I don't get it. Can you just help me with the questions? Please

Answer 7

https://www.mun.ca/biology/scarr/Watson-Crick_Model.html

Answer 8

OpenStudy policy forbids me to just give answers. I have summarized the needed material into just a few sentences. Please give them a try and I will confirm.

Answer 9

@JoannaBlackwelder Are these right? 2. Are the phosphate groups on the interior or the exterior of the DNA molecule?
The phosphate groups are on the exterior of the DNA molecule.

3. Are the sugar groups on the interior or the exterior of the DNA molecule?
The sugar groups are on the exterior of the DNA molecule.

Answer 10

Yep. Those look good. :-)

Answer 11

1. Are the bases on the interior or the exterior of the double helix? Are they randomly arranged or neatly stacked?
The bases are on the interior of the double helix. They are neatly stacked

What about this one?

Answer 12

Yep, looks great! I knew you could do it! :D

Answer 13

THANKS!:)

Answer 14

No problem