I think the correct answer would be the first option. It is the carbohydrates that is used as markers by cells to help recognize each other. Sugar chains are being used by the cells which are found on the outer membrane to help identify other cells.
Answer: B. Water molecules slow down until they begin to bond together.
Explanation: When water is cooled, energy is removed from the system, and the molecules begin to slow down. When the molecules have slowed suciently, their collisions are no longer energetic enough to overcome their electrostatic attraction, and they begin to bond together. The other answer choices are inaccurate. Since ice is less dense than water, high pressure compresses the ice and actually causes it to melt. (Compression has no effect on water volume.) Cooling has no effect on the shape of individual water molecules.
The cell would never be able to be in a the stage of the cell cycle where it is just doing its job (which would depend on its specialization). The other phases are all dedicated to replicating (dividing) the cell from one to two cells. Interphase allows the cell time to just preform the job (function) it was created to do.
If a cell is grown in a medium containing radioactively labeled thymidine--which is one of the nucleotides needed to synthesize DNA--after the first round of replication, all of the DNA molecules will have one labeled strand and one unlabeled strand. Why? Because the radioactively labeled thymidine will be incorporated into the newly synthesized strands. If the cell undergoes ANOTHER round of replication in the same medium, the same sequence of events will occur.
Type O would be your answer hope this helps