When double-stranded DNA is heated at neutral pH, which change does NOT occur?
A) The absorption of ultraviolet (260 nm) light increases.
B) The covalent N-glycosidic bond between the base and the pentose breaks.
C) The helical structure unwinds.
D) The hydrogen bonds between A and T break.
E) The viscosity of the solution decreases.

Question

Quizplus · Accepted Answer

Heating double-stranded DNA at neutral pH causes the following changes: (A) The absorption of ultraviolet (260 nm) light increases due to the separation of the two strands. (C) The helical structure unwinds as the hydrogen bonds between the two strands break. (D) The hydrogen bonds between A and T break, as well as between C and G. However, (B) the covalent N-glycosidic bond between the base and the pentose does not break during heating at neutral pH. (E) The viscosity of the solution decreases due to the unwinding of the helix.

When Double-Stranded DNA Is Heated at Neutral PH, Which Change