| Response: Anvil/Forge Posted By: Greg Bear - 07/28/2006 11:56:48 AM Still under option. Studio engaged in "silent running." | |
| Response: Why did it take me so long? Posted By: Greg Bear - 07/26/2006 12:30:59 PM Thanks, Loni. Studying biology right now is both exciting and immensely rewarding. Good luck! | |
| Response: Epiphanies in Darwin's Children Posted By: Greg Bear - 07/25/2006 02:07:11 PM That would make your job much too easy, Paul! I'll leave this one unanswered for now. | |
| Response: "Vitals" question... Posted By: Greg Bear - 07/14/2006 01:13:47 PM Happy to make your salad bar visits more memorable, Joanne! | |
| Response: Viruses - alive? Posted By: Greg Bear - 07/03/2006 02:28:48 PM Hello, Joanne! Strictly speaking, viruses are no more alive than RNA or DNA are "alive." Viruses need to hijack cellular machinery to reproduce. Thus, when a virus invades a cell and activates that cell's machinery, some might say the virus is at that point "alive." It's certainly in the driver's seat! But it's not autonomous--it cannot perform any of these functions by itself, and without the cell, it is pretty much "lifeless." So--a "killed" virus is one that can't fully activate a cell. That phrase is a little contradictory. I like to think of viruses as FedEx for genes--a transport system for segments of RNA or DNA. All the packaging is done back at the plant--within the cell, however. (And let's not get into the address labels, return receipts...etc!) Some have speculated that viruses originated on comets. This seems difficult to accept, however, because viral RNA or DNA must fit into an even more complicated and vigilant genetic system. Nearly all viruses are neatly attuned to the cells they invade. The cells evolve, and the viruses evolve with them, to keep up! |