Final answer:
The suffix '-ogen' does not indicate whether a compound is colorless or colored but often denotes a precursor. For example, urobilinogen is not directly linked to color, but a color change may occur during its conversion to other compounds or due to pH changes.
Step-by-step explanation:
The suffix "-ogen" in a compound's name does not necessarily indicate whether the compound is colorless or colored. Instead, this suffix is often used in biochemical terminology to denote a precursor or a compound that can give rise to another compound, especially through a biological process. For instance, in the case of urobilinogen, the 'ogen' suffix indicates that it is a precursor to urobilin. It is not directly associated with the color of the compound. However, in some contexts, a color change may occur when a precursor compound is converted into its active form, or when indicators change color due to pH changes, like phenolphthalein turning red or pink in basic solutions. Thus, the suffix 'ogen' does not specifically imply that the compound is colorless.