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.
In prokaryotes, RNA polymerase is the helicase that unzips the dsDNA for transcription. In eukaryotes, transcription factor II H (TFII H) is the helicase that unzips the dsDNA.TFII H also functions as a kinase.ith the primer in place, DNA polymerase catalyzes the synthesis of a new strand of DNA. The new nucleotides align themselves with the old DNA. These strands grow from the 5'--3' direction.