It is probable that when DNA is tightly coiled, a) prokaryotes can reproduce.
b) DNA cannot be transcribed.
c) the genes are active.
d) DNA can be transcribed.

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment