Dextrans are polysaccharides produced by some bacteria. They are polymers of α-D-glucose linked by α(1 → 6) glycosidic bonds, with frequent α(1 → 3) branching. Choose the correct portion of a dextran, including one branch point. Dextrans are polysaccharides produced by some bacteria. They are polymers of -D-glucose linked by (1 → 6) glycosidic bonds, with frequent (1 → 3) branching. Choose the correct portion of a dextran, including one branch point.

This question is incomplete

Explanation:

This question is incomplete, however the question seeks to test the students ability to identify a dextran. The question already gives a brief description of a dextran hence the attachment provides a visual representation of what has been described in the question.

Dextrans are polysaccharides made up of individual glucose units (monomers) that are joined together by α(1 → 6) glycosidic bonds (as seen in the second diagram of the attachment); i.e the C-1 (illustrated as α-1 in the attachment) of one glucose unit is linked to the C-6 (illustrated as α-6 in the attachment) of another glucose unit by glycosidic bond. These dextran polymers are also characterized by branches from α(1 → 3) [as seen in the second diagram of the attachment]; i.e the C-1 (illustrated as α-1 in the attachment) of the branch glucose molecule is attached to the C-3 (illustrated as α-3 in the attachment) of a glucose unit in the polymer chain of the dextran.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.