basal membrane, a sheet of tissue that forms the outer layer of the choroid and lies just under the pigmented layer of the retina. It is composed of elastic fibers in an otherwise thin homogenous layer.asal membrane, a sheet of tissue that forms the outer layer of the choroid and lies just under the pigmented layer of the retina. It is composed of elastic fibers in an otherwise thin homogenous layer.
There are several enzymes that 'unzip' DNA. These enzymes are collectively known as DNA helicases. DNA helicases are helix-destabilizing enzymes that bind to DNA at the origin of replication and break hydrogen bonds, thereby separating the two strands.. Solomon, Eldra P., Linda R. Berg, and Diana W. Martin. Biology. 8th ed. Belmont, CA: Thomson Brooks/Cole, 2008.
The enzyme helicase catalyzes the unwinding and the breaking of H-bonds to create a separated section of DNA. The open section is known as a replication bubble and in contains two replication forks.Many different replication bubbles are formed along the DNA structure.he enzyme helicase catalyzes the unwinding and the breaking of H-bonds to create a separated section of DNA. The open section is known as a replication bubble and in contains two replication forks.