Out here in the stroma, a bunch of different enzymes use the carbon dioxide molecules and hydrogen ions made during the light dependent phase to assemble sugar fragments which are half of a glucose molecule (just 3 carbon atoms, instead of the 6 required to make a complete glucose molecule).
An alkane, by definition, only has single bonds. Even if your second diagram made sense (it doesn't for the reason above) it would not be an alkane at all because there is a double bond. Alkanes are a functional group. It's called alkil. As a functional group they have the generic formula R(CH2)nH.
Those monosaccharides that contain an aldehyde functional group are called aldosesA monosaccharide that contains an aldehyde functional group. ; those containing a ketone functional group on the second carbon atom are ketosesA monosaccharide that contains a ketone functional group on the second carbon atom. .hose monosaccharides that contain an aldehyde functional group are called aldosesA monosaccharide that contains an aldehyde functional group. ; those containing a ketone functional group on the second carbon atom are ketosesA monosaccharide that contains a ketone functional group on the second carbon atom. .