What are the locations in the cell cycle where proteins can initiate or stop the next phase of the cycle called?

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Nucleic acids offer variability because they contain alternate forms of genes called .

What two conditions must be present for osmosis to occur?