Bio Help please help appreciated.?





Write an essay that details the structure and function of a eukaryotic cell, how its cell membrane functions, and details of how that cell will carry out mitosis and meiosis.10 points to the person who puts it up quickly and the answer is correct.I doesn't have to be very long maybe 1-2 paragraphs. Answers such as "do your homework", "you can just do it yourself" etc. WILL NOT get best answer, so don't even bother.



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One Response to “Bio Help please help appreciated.?”

  1. pacifyingly says:

    Eu = “true”, karyon = “nucleus”The most noticeable feature that differentiates these more complex cells from prokaryotes is the presence of a nucleus, a double membrane-bound control center separating the genetic material, DNA (deoxyribonucleic acid), from the rest of the cell.In addition to the plasma membrane, eukaryotic cells contain internal membrane-bound structures called organelles. Organelles, such as mitochondria and chloroplasts, are both believed to have evolved from prokaryotes that began living symbiotically within eukaryotic cells. These vital organelles are involved in metabolism and energy conversion within the cell. Other cellular organelles within eukaryotic cell structure carry out the many additional functions required for the cell to survive, thrive, grow and reproduce.Eukaryotic cells can reproduce in one of several ways, including meiosis (sexual reproduction) and mitosis (cell division producing identical daughter cells). The cytoplasmic membrane (also called the plasma or cell membrane) in eukaryotic cells, as in prokaryotes, is a fluid phospholipid bilayer embedded with proteins and glycoproteins. The phospholipid bilayer is arranged so that the polar ends of the molecules (the phosphate and glycerol portion of the phospholipid that is soluble in water) form the outermost and innermost surface of the membrane while the non-polar ends (the fatty acid portions of the phospholipids that are insoluble in water) form the center of the membrane .In addition, it contains glycolipids as well as complex lipids called sterols, such as the cholesterol molecules found in animal cell membranes, that are not found in prokaryotic membranes (except for some mycoplasmas). The sterols make the membrane less permeable to most biological molecules, help to stabilize the membrane, and probably add rigidity to the membranes aiding in the ability of eukaryotic cells lacking a cell wall to resist osmotic lysis. The proteins and glycoproteins in the cytoplasmic membrane are quite diverse and function as: a. channel proteins to form pores for the free transport of small molecules and ions across the membrane b. carrier proteins for facilitated diffusion and active transport of molecules and ions across the membrane c. cell recognition proteins that identifies a particular cell d. receptor proteins that bind specific molecules such as hormones and cytokines e. enzymatic proteins that catalyze specific chemical reactions.As in prokaryotes, the cytoplasmic membrane is a semipermeable membrane that determines what goes in and out of the cell. In addition to . Substances may cross the cytoplasmic membrane of eukaryotic cells by simple diffusion, osmosis, passive transport, active transport, endocytosis and exocytosis. We will now review each of these methods of transport.The Phases of MitosisProphase:The beginning of mitosis is called prophase. In early prophase, the centrosomes move toward opposite poles of the cell, organizing the spindle microtubules between them. The sister chromatids become visible in the nucleus as they condense.Metaphase:The chromatids remain lined up between the poles of the cell during metaphase.Anaphase:Anaphase begins when the pairs of sister chromatids separate. The separated chromatids are now called chromosomes, and move toward the poles of the cell.Telophase:The chromosomes arrive at the poles in telophase, and new nuclear membranes form around them.Cytokinesis:Division of the cytoplasmic components is called cytokinesis.In animal cells, cytokinesis occurs when a ring of actin and myosin filaments constricts the plasma membrane at the equator. Eventually, the parent cell is divided into two cells.In plant cells, a number of small vesicles fuse at the metaphase plate to form the cell plate. Over time, the cell plate reaches across the cell and joins with the plasma membrane.Interphase:The process of mitosis and cytokinesis creates two separate cells, each with an identical set of chromosomes. After cytokinesis, the daughter cells will enter interphase.for Meiosis visit [external link] …