Definition An intermodal land bridge refers to the shipping of a container from one country to another using an ocean vessel and during the route the container must be unloaded on a body of land and transported completely across the landmass until it reaches another port where a second ocean vessel can finish the route.â¦
Opening the button gives a little room, but not enough for you to get into the jeans. You then pull down the zipper, which opens the jeans up even more, giving you the space you need to get into them. This is very similar to the role that DNA helicase plays in DNA replication: DNA helicase is the zipper. It unzips our DNA strands to allow space for attachment and to expose the nucleotides that are used as a template during DNA replication and transcription.
Lesson Summary. Let's review what we've learned so far. DNA helicase is the enzyme that unwinds the DNA double helix by breaking the hydrogen bonds down the center of the strand. It begins at a site called the origin of replication, and it creates a replication fork by separating the two sides of the parental DNA.