Replacing your home's windows to improve its overall resale value is an investment to consider carefully. For the average-sized U.S. home, installing an entire set of brand-new windows can easily cost more than $10,000.
A molecule of DNA is double-stranded. The molecule has the shape of a double helix, typically right handed (B form DNA).The DNA molecule consists of two complementary strands oriented in an antiparallel fashion. Each strand is composed of nucleotides.he twisted ladder metaphorA DNA molecule is often likened to a spiral (or twisted) ladder. In this analogy, the rungs of the ladder are the base pairs (A-T and G-C). The sides of the ladder are the sugar-phosphate backbones of the two strands. This refers to B form DNA.
The name DNA stands for deoxyribonucleic acid. By breaking down the name, we can understand the structure of the molecule. DNA is a long string of nucleotide units attached to one another. In a single nucleotide there are three components: 1) a sugar molecule, 2) a phosphate group, and 3) a nitrogenous base.(See Figure B-2.) In DNA, the sugar molecule happens to called deoxyribose, hence the name deoxyribonucleic acid.n summary, a double helix of DNA is composed of two spiraling, complementary strands of DNA. Each strand is composed of a sugar and phosphate backbone with varying nitrogenous bases sticking in towards the center. The two strands are joined together at the center by pairing bases lined up with one another.