<em>G1, S and G2 phases are all cumulatively referred to as interphase involving the growth of a cell and the replication of its DNA. Initially in G1 phase, the cell grows physically and increases the volume of both protein and organelles. In S phase, the cell copies its DNA to produce two sister chromatids and replicates its nucleosomes. Finally, G2 phase involves further cell growth and organisation of cellular contents. The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells. The S phase only begins when the cell has passed the G1 checkpoint and has grown enough to contain double the DNA. S phase is halted by a protein called p16 until this happens.</em>
<em> </em><em>characteristics</em><em> </em><em>of</em><em> </em><em>single</em><em> </em><em>cellular</em><em> </em><em>organism</em><em> </em><em>:</em>
- <em>all</em><em> </em><em>life</em><em> </em><em>processes</em><em> </em><em>are</em><em> </em><em>conducted</em><em> </em><em>by</em><em> </em><em>single</em><em> </em><em>cell</em>
- <em>reproduces</em><em> </em><em>asexually</em><em> </em>
- <em>generally</em><em> </em><em>have</em><em> </em><em>special</em><em> </em><em>projections</em><em> </em><em>for</em><em> </em><em>movement</em><em>.</em><em> </em>eg. cilia in paramesium .
- <em>food</em><em> </em><em>and</em><em> </em><em>other</em><em> </em><em>substances</em><em> </em><em>are</em><em> </em><em>transported</em><em> </em><em>by</em><em> </em><em>diffusion</em>
<em>i</em><em> </em><em>hope</em><em> </em><em>it</em><em> </em><em>helped</em><em>.</em><em>.</em><em>.</em>
Phytoplankton are essential to aquatic life zones because: they provide the basis of food chains. Log in for more information. Added 5/22/2016 9:52:12 AM This answer has been confirmed as correct and helpful.
Answer: spore a single haploid cell (with genetic information from only one parent surrounded by a hard, outer wall.
Explanation:
Taproot and Fibrous roots
