A scientist was testing an unknown chemical for the presence of various sugars and
found that the only sugar present was the monosaccharide ribose. Which of the
following molecules is most likely the unknown chemical?

A scientist was testing an unknown chemical for the presence of various sugars and  found that the only sugar present was the monosaccharide ribose. Which of the  following molecules is most likely the unknown chemical?

The unknown chemical is Barfoed's reagent which contains acetic acid and copper ii acetate. Barfoed test  is used for the detection of monosaccharide

Explanation:

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.