inIn the photosynthetic dark reaction there are two types of reactions :light dependent light-dependent and independentlight-independent. in In the independentlight-independent reactions duringduring reduction 3-phosphoglycerate is converted to glyceraldehyde-3-phosphate. I don't find any difference between them because both have a 3 carbon chain attached to a phosphate group. can uCan you please clear it up for me because my book says that the latter one is a sugar. why Why isn't the first one sugar too?