Recitations start this week.
Quizzes start next week.
Note the numbering system, so we can talk about the various carbons in the chain. Numbering usually begins at the end closest to the carbon that has the least number of hydrogens or most oxygens. Compare the diagram drawn here with that in the middle of the glucose handout to note some organic chemistry shorthand. Since carbon is so common inorganic compounds and always takes four bonds, we can simply leave it out, with the understanding that a carbon atom is present at the vertex of 2 or more bonds. In 3-dimensional space, a hexose chain can easily curl up, such that the oxygen attached to carbon 5 can be juxtaposed next to carbon 1.