11 - 20 of 28 Answers
September 10, 2009:
I would really appreciate your expertise and your notions as to the evolutionary significance of introns. What do they do in eukaryotic genomes and why do prokaryotes not have introns?
July 23, 2009:
Does my DNA last forever?
July 16, 2009:
I was wondering how do you get from a gene to a blue eye?
December 16, 2008:
So, what is the difference between a chromosome, a gene, a protein and DNA? I mean where do they all fit in?
August 14, 2008:
What is a mutated gene?
August 7, 2008:
What happens to the host cell's machinery when a virus injects its genetic information? For instance, what happens to the cell's own genetic machinery such as the chromosomes and the DNA coiled in it? Why do enzymes take orders or instructions from the foreign DNA and not from the DNA coiled in the chromosomes?
August 17, 2006:
Why is it that there is a T base to complement an A base in DNA, but a U base in the case of RNA?
May 3, 2005:
Why is DNA shaped as a spiral?
January 14, 2005:
How true is the saying? The apple does not fall far from the tree. Please give a comparison of human and plant DNA. A picture of plant and human DNA sequences would be nice, so that I can see the similarities.
August 3, 2004:
Does DNA account for only physical attributes of a human being, or can it also carry an emotional history from one generation to the next? I am wondering if the psychological damage of slavery for African Americans, for example, is carried forward into current generations on not only a psychological basis, but also a physical one.