C2

■ They carry chemical energy in their bonds. ■ adenosine triphosphate, p. 24

■ They are part of certain enzymes. ■ CoA, p. 139

■ They serve as specific signaling molecules. ■ cyclic AMR p. 185

The nucleotides of DNA are composed of three units: a nitrogen-containing ring compound, called a base; which is covalently bonded to a 5-carbon sugar molecule, deoxyribose;

O— which in turn is bonded to a phosphate molecule (figure 2.22). The four different nitrogen-containing bases can be divided into two groups according to their ring structures: two purines, adenine and guanine, which

Figure 2.21 Structures of Three Important Polysaccharides The three molecules shown consist of the same subunit, D-glucose, yet they are distinctly different molecules because of differences in linkage that join the molecules (a and b; 1,4 or 1,6), the degree of branching, and the bonds involved in branching (not shown).Weak hydrogen bonds are also involved.

Getting Rid Of Warts Forever

Getting Rid Of Warts Forever

All wart sufferers, this is the day to stop the shame. How I Got Rid Of My Warts Forever and How You Can Get Rid Of Warts Naturally In 3 Days. With No Blisters, No Scars, And No Pain Without medications or expensive procedures. All by applying a simple, very natural and unbelievable FREE substance that can be found in almost every household.

Get My Free Ebook


Post a comment