What would it take for human cells to correctly divide and regenerate themselves indefinitely?
Q. Looking at it from the normal biological viewpoint, the reason humans age and eventually die is that cells, over time, slowly lose their ability to correctly divide and regenerate themselves. As time passes, cells lose small but cumulative portions of their ability to divide correctly and with fidelity to the original. That is allegedly why we age and eventually die (if of normal causes). On the other hand, we have cancer... cells that refuse to die, continue dividing indefinitely but do so with deadly mutations and changes that produce cells that become malignant tumors, etc. Is it possible for cells to be able to regenerate and reproduce indefinitely but do so without losing the ability to correctly replicate the original cell? What… [cont.]
Asked by flybd5 - Tue Apr 8 17:05:25 2008 - - 2 Answers - 0 Comments

A. There are at least four conditions that must be meant if a cell is to remain continuously young: 1. It must replicate and repair its DNA with precision. 2. Its telomeres must be lengthen back to normal every so many cell divisions. 3. It must rid itself of oxidents (metabolic toxins). 4. It must mantain its mitochondria (energy source) at peak performance. There are probably other requirments but these are the four primary ones. Aging, it appears, in normal somatic cells is a trade-off made for being differentiated (specialized). In cancer, becoming immortal is a result of dedifferentiation (becoming unspecialized). It seems that the nature of cancer cells and that of normal somatic cells are diametrically opposites. Cancer cells… [cont.]
Answered by Bob D - Tue Apr 8 18:04:38 2008

How do memory cells work in triggering the secondary immune response?
Q. I know that they make the secondary response more rapid, but how? do they differentiate into plasma cells to make the antibodies themselves, or do they trigger the production of more plasma cells?
Asked by SB1 - Mon Apr 20 15:45:07 2009 - - 2 Answers - 0 Comments

A. well the first time that your body encounters the pathogen it has an innate immune response and the attack is not specific for the pathogen that is invading and it can only distinguish self vs non-self. If this does not work your body releases more serious attacks which is T cells. T cells activate B cells. Your body makes a history book and records this specific battle by making memory B cells. B cells are responsible for making antibodies. So the second time your body encounters this same pathogen it does not have to go through this whole long process. It will just clone the memory B cells which contain the antibodies causing lots of antibody production...thus the quick response =)
Answered by roxy_k88 - Mon Apr 20 16:54:46 2009

How do cells make up animals and plants?
Q. My homework is to describe how animal and plants are made from cells.Please help me!Thanx everyone!
Asked by Jessica Mole - Wed Oct 28 04:46:00 2009 - - 1 Answers - 0 Comments

A. several cells join together to form an organ, several organs form a system,i.e animal or plant system
Answered by Nelly C - Wed Oct 28 05:12:09 2009