The monosaccharide found in some bacteria and occurring rarely are______________?

Explanation

Tetroses are four-carbon monosaccharides and are relatively rare, occurring in some bacteria and in a few metabolic pathways. Trioses, pentoses and hexoses are more commonly discussed because they participate widely in cellular metabolism and nucleic-acid or energy-related structures. Students may choose pentoses or hexoses because they are familiar biological sugars, but the clue that the sugars are rare points to tetroses.