DNA questionsWatch this thread
The spiral or helices occurs due to the same reason. The bonding between the phosphates and ribose sugars will arrange themselves in a state which requires the least amount of energy to remain stable, therefore the more they are fighting to keep the hydrophobic bases in contact with water molecules, the more energy is needed to maintain that state. A bond angle of 180 degrees leaves huge gaps in between nucleotide base pairs in which the bases will come into contact with water (see figure 1 beautifully drawn using paint).
The best shape that allows the bonding between the phosphates and the ribose sugars to be at the least possible energy state is with the base pairs as close together as possible. Due to the fact that the bonding length/distance can't be 'squashed', staggering the ladder shape created by 180 degree bond angles into a shape more reminiscent of a set of stairs and then adding a twist or helices compacts the nucleotide bases as much as possible.
Can someone explain to me how the double helix is formed in DNA and the why it's important to DNA please -.-
The DNA double helix is formed by alternating phosphate groups and deoxyribose. Inside the DNA double helix guanine is linked with cytosine, while adenine is linked with thymine.
This DNA double helix contains the genetic information. If this genetic information is ruined by wrong linking nucleobases, it may cause genetic diseases.
So it's due to the polarity if the phosphate group if one nucleotide and the deoxyribose of another nucleotide?
The hydrogen bonds consists of polarities, but I'm not entirely sure if this applies to the other compounds too.