(may be written HS—)
Cysteine is an important sulfur-containing amino acid.
Two sulfhydryl groups can react, forming a covalent bond. This “cross-linking” helps stabilize protein structure.
cysteines in hair
proteins maintains the curliness or straightness of hair. Straight hair can be “permanently” curled by shaping it around curlers, then breaking
and re-forming the
In addition to taking part in many important chemical reactions in cells, glycerol phosphate provides the backbone for phospholipids, the most prevalent molecules in cell membranes.
Contributes negative charge to the molecule of which it is a part (2– when at the end of a molecule; 1– when located internally in a chain of phosphates).
Has the potential to react with water, releasing energy.
5-Methyl cytidine is a component of DNA that has been modified by addition of the methyl group.
Addition of a methyl group to DNA, or to molecules bound to DNA, affects expression of genes.
Arrangement of methyl groups in male and female sex hormones affects
their shape and function.
One phosphate molecule, adenosine triphosphate (ATP), is the primary energy-transferring molecule in the cell
ATP consists of an organic molecule called adenosine attached to a string of three phosphate groups
The versatility of carbon makes possible the great diversity of organic molecules
Variation at the molecular level lies at the foundation of all biological diversity
Reacts with H2O