-- card: 52870 from stack: in
-- bmap block id: 34590
-- flags: 0000
-- background id: 2665
-- name: 


-- part 1 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=332 top=167 right=189 bottom=432
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: BASE PAIR
----- HyperTalk script -----
on mouseUp
  go to card id 57914
end mouseUp




-- part 3 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=205 top=315 right=337 bottom=256
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: NEXT
----- HyperTalk script -----
on mouseUp
  go to next card
end mouseUp



-- part 4 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=149 top=314 right=337 bottom=199
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: PREV.
----- HyperTalk script -----
on mouseUp
  go back
end mouseUp



-- part contents for background part 1
----- text -----
DEFINITIONS

-- part contents for background part 2
----- text -----


BASE PAIR: A structural unit in DNA consisting of either an Adenine- Thymine or a Guanine-Cytosine link across the double strands of the molecule. Adenine always links with thymine, guanine with cytosine due to the arrangement of the hydrogen donors and receptors between these bases. In the diagram at the right, a portion of the lac enzyme promotor region on E. coli is shown. The 
"TATA" box is in bold and is thought to serve as a firm binding site for RNA polymerase. There are 13 base pairs in this diagram. Click on the button to see one of them.