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In 1665, Robert Hooke invented a better microscope.  He coined the name "cell" after the very small rooms in which monks lived!

DNA GENES:
For Parents & Teachers

     "I'm so glad you're interested in what I do!

   "Like I said, in the easy step, free

nucleotides just float in, with A and T matching up all on their own, and C and G matching up all on their own.  Their size and those sticky spots help them match up correctly.  Now, my job comes in.   I super-glue the new nucleotides together.  Scientists call these super-glue spots, 'covalent bonds'.

     "See how the nucleotides just float in?   They always match up with a big one opposite a small one and with the same number of sticky spots.  That sure makes things a lot easier!  To keep them in the right order, I super-glue the new nucleotides together.  Its just like the zipper!

One chromosome
Un-zip
Match new nucleotides with old nucleotides
Link up new nucleotides
Un-zip some more...
Two chromosomes

     "And we continue un-zipping, matching, and linking until we are done!"

     "And when we are done, we have two chromosomes!  Each with one old strand and one new strand!  Do you see how the new DNA strands are exact copies of  old strands?

     "And so, nucleotide by nucleotide, we construct exact copies of all the chromosomes in time for cell division.   Whew!  It's quite a job.

     "It was so nice of you to visit.  Come back any time.  I might suggest you find my friend, Chloe the chloroplast.   I'm sure she'd love to show you around the whole cell.

     "Bye-bye for now!"

DNA GENES:   For Parents & Teachers

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