What prefix means "sour" or often relates to sugar?

The prefix "glyc-" is derived from the Greek word "glykys," which translates to "sweet" or "sugar." It is commonly used in scientific and medical terminology to refer to substances related to sugars, particularly glucose, which is a simple sugar. Thus, when encountering terms like "glycogen" (a form of stored glucose) or "glycolysis" (the metabolic pathway that breaks down glucose), the prefix "glyc-" indicates a connection to sugar.

This understanding emphasizes the association of the prefix not only with sweetness but also with the metabolic processes involving sugar, which can have sour notes in the context of fermentation and spoilage. In contrast, the other prefixes do not correlate with sourness or sugar-related terminology, which reinforces why "glyc-" is the appropriate choice here.