Chemistry - Biomolecules Question with Solution | TestHub

A. $\alpha$-D-Glucopyranose is a cyclic monosaccharide with a hemiacetal group, which allows it to open to an aldehyde in solution, making it a reducing sugar. This statement is correct.

B. $\alpha$-D-Glucopyranose and $\beta$-D-Glucopyranose are anomers, differing in the configuration at the anomeric carbon (C1). This statement is correct.

C. DNA strands are antiparallel and complementary (A pairs with T, G pairs with C), not identical. This statement is incorrect.

D. Glucose is an aldose and will react with $\mathrm{B}{\mathrm{r}}_2/{\mathrm{H}}_2\mathrm{O}$ (a mild oxidizing agent) to form gluconic acid. Fructose is a ketose and generally does not react with $\mathrm{B}{\mathrm{r}}_2/{\mathrm{H}}_2\mathrm{O}$ under these conditions. Thus, they can be differentiated. This statement is correct.