Answer:
The main difference is the presence of a nucleus.
Explanation:
One of the biggest differences is the presence of a nucleus with an envelope. This is very important because in eukaryotes it is present, but in prokaryotes, the genetic material is in the cytosol, although it's not exactly dispersed, it's slightly grouped. Also, the DNA in prokaryotes is organized in circular chromosomes while in eukaryotes it's organized in linear chromosomes arranged in an X shape. There are many more differences, but these two are the more important ones.
Molecules that cannot cross the membrane bind to receptors in the membrane. When the signal binds to a receptor changes it's shape. Other Molecules inside the cell respond to the chainging shape of the receptor.
Choice A is false. RNA uses the 5 carbon sugar Ribose
Answer:
on average, only about 10% of energy stored as biomass in one trophic level-e.g, primary producers-gets stored as biomass in the next trophic level-e.g, primary consumers. Put another way. net productivity usually drops by a factor of ten from one trophic level of the next.
