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 (from the Greek skleros, meaning hard), also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the eye containing collagen and elastic fiber.he sclera forms the posterior five-sixths of the connective tissue coat of the globe. It is continuous with the dura mater and the cornea, and maintains the shape of the globe, offering resistance to internal and external forces, and provides an attachment for the extraocular muscle insertions.
A tough white covering called the sclera protects the eye. Part of the white sclera can be seen in the front of the eye. A clear, delicate membrane called the conjunctiva covers the sclera. At the front of the eye is the cornea.The cornea is the clear part of the eyeâs protective covering. It allows light to enter the eye. The iris is the colored part of the eye that contracts and expands so the pupil can let just the right amount of light into the eye.The light is directed by the pupil to the lens. tough white covering called the sclera protects the eye. Part of the white sclera can be seen in the front of the eye. A clear, delicate membrane called the conjunctiva covers the sclera. At the front of the eye is the cornea.