The monomer units of DNA are nucleotides. Each of these consist of  a 5-carbon sugar which is deoxyribose, a nitrogen containing base  attached to the sugar and a phosphate â¦ group. Judy Olmsted. 78,524 Contributions. Retired college science professor. DNA is a nucleic acid. Nucleic acids are polymers of nucleotides (also called mononucleotides).   The nucleotides in DNA are deoxyribonucleotides.   Each nucleotid â¦ e consists of a pentose (5-carbon) sugar, a nitrogen-containing base and a phosphate group.
The sclera is an outer fibrous layer that encases and protects the eyeball. The cornea controls and focuses the entry of light into the eye, protects against germs and other â¦ matter from entering the eye as well.4 people found this useful. Answered.he Sclera is the posterior opaque white/off-white surface of the eye; this dense fibrous tissue envelops the entire posterior surface of the eye, excluding the continuous ant â¦ eriorly of the cornea, iris, and pupil which is at its center.
In humans the whole sclera is white, contrasting with the coloured iris, but in other mammals the visible part of the sclera matches the colour of the iris, so the white part does not normally show. In the development of the embryo, the sclera is derived from the neural crest.he cornea, unlike the sclera, has five layers. The middle, thickest layer is also called the stroma. The sclera, like the cornea, contains a basal endothelium, above which there is the lamina fusca, containing a high count of pigment cells.