RNA differs from DNA in that RNA: A. contains a different sugar molecule.

B. contains the nitrogen base uracil.

C. All of the above

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic