Hanks, who has won two Oscars but hasnât been nominated in 13 years, was overlooked for both âCaptain Phillipsâ and âSaving Mr. Banks.â. SNUB: âInside Llewyn Davis.â Even with nine best picture nominees, the Coen brothers, a perennial Academy favorite, lost out this time in the top category with their musical dramedy.
Anti-parallel strands. The DNA molecule is composed of two strands held together by hydrogen bonds. A single strand is different at its two ends. One end is called 5' (5 prime), the other is called 3' (3 prime). The names come from the notation for the two sugar carbon atoms which participate in the phosphodiester bonds. The different strands in the helix run in opposite (anti-parallel) directions. At each end of the double helix, one strand is 5' and the other is 3'. In the illustration, the 3' end is shown with a red arrowhead and the 5' end with the yellow connector.
The two DNA strands are complementary and parallel, but they go in opposite directions. The antiparallel structure of DNA is important in DNA replication because it replicates the leading strand one way and the lagging strand the other way. The antiparallel strands allow for the formation of hydrogen bonds between the nitrogenous bases of DNA. If the strands were not antiparallel these nonsymetrical hydrogen bonding interactions would not be possible. It is important that CG interactions have three H- bonds, and AT have two H-bonds.