<prompt> An L isomer of monosaccharide formed in the human body isL-FructoseL-ErythroseL-xyloseL-Xylulose  <response>: Monosaccharides are those sugars that cannot be hydrolyzed into simpler carbohydrates. They may be classified as trioses, tetroses, pentoses, hexoses, or heptoses, depending upon the number of carbon atoms 3-7, and as aldoses or ketoses, depending on whether they have an aldehyde or ketone group. d and l isomerism: The designation of a sugar isomer as the d form or its mirror image as the l form is determined by its spatial relationship to the parent compound of the carbohydrates, the three-carbon sugar glycerose glyceraldehyde.Pentoses of Physiological ImpoanceSugarBiochemical and ClinicalImpoanced-RiboseStructural component ofnucleic acids andcoenzymes, includingATP, NADP, and flavincoenzymesd-RibuloseIntermediate in the pentosephosphate pathwayd-ArabinoseConstituent of glycoproteinsd-XyloseConstituent ofglycoproteinsl-XyluloseExcreted in the urine inessential pentosuriaRef: Harper;s Biochemistry; 30th edition; Chapter 15; Carbohydrates of Physiological Significance 