Cell Questions

1) The integrity of the plasma membrane is essential for cellular survival. Could the immune system utilize this fact to destroy foreign cells that have invaded the body? How might cells of the immune system disrupt membranes of foreign cells? (Two hints: virtually all cells can secrete proteins, and some proteins form pores in membranes.) 2) Most cells are very small. What physical and metabolic constraints limit cell size? What problems would an enormous cell encounter? What adaptations might help a very large cell to survive? 3) Some species of bacteria that live at the surface of sediment on the bottom of lakes are facultative anaerobes; that is, they are capable of either aerob... click for more

Stem Cell

The question I have to give my persepective on is: "Should therapeutic cloning be banned? I have these readings that I need to read to be able me to support this question...I don't know really how to take it from the reading material and do a 1000-1500 word paper about it? Do I create a thesis statement out of the question? I attached a file for you to read so you know where I am coming from.

Are Viruses Alive?

Argue for or against the statement, "Viruses are alive." As before this is not an opinion question. State your position clearly: Yes, No or Don't Know and support your position with what you know about cells, living things and viruses. The internal structure of many protists is much more complex than that of cells of multicellular organisms. Does this mean that the protist is engaged in more complex activities than the multicellular organism? If not, why should the single celled protist be much more complicated? It might be a good idea to think about the environment of a singled celled organism and compare that to the environment a cell is in as part of a multicellular organism.

Polar molecules

This is a question i've been having trouble with. A. Most polar molecules and ions cannot enter cells. Why? B. Many food particles are polar. How do these get into the cell?

Name the structure...

Download the image (attached) 1. Name the structure to which the arrow points. 2. Give an example of a specific organism which has the structure. 3. Briefly describe at least one function the structure performs (what it helps the organism do).