Reading Comprehension Quiz

**Use the dictionary, the acronym finder, and the word origins dictionary (links above) as needed. A new quiz is available each Monday through Thursday. This is the quiz for March 17.**

Francis Crick and James Watson are given credit for discovering the structure of DNA, but it was Rosalind Franklin who had narrowed the structure down to some sort of double helix. Watson fitted the pieces of information into place by creating cardboard replicas of the four bases that, we now know, constitute DNA's alphabet: adenine, thymine, guanine and cytosine, or A, T, G and C. The pairs of A-T and G-C, he realized, could serve as the rungs on the twisting ladder of DNA.

In the double helix, a single strand is paired, rung by rung, with its complementary strand. When the double helix unzips, each of the resulting two helixes attacts its opposites - A attracts T, etc. Two new double helixes are built.

Watson's famous "Aha!" was but the last in a long chain of "ahas." It was Crick whose friend had a hunch of a natural attraction between A and T, on the one hand, and C and G, on the other hand, but it was Watson who first learned of the rules governing the amounts of A, T, G, and C in DNA. It was thanks to synergy that the final discovery was made.

1. A helix is most like
A. a circle.
B. a series of circles.
C. a coiled spring.
D. a scissors.
2. Synergy means
A. the working together of two things.
B. energy.
C. sympathy.
D. united.
3. Adenine attracts
A. guanine.
B. thymine.
C. cytosine.
D. none of the above.
4. DNA is
A. an equation in mathematics.
B. a cell.
C. an attraction of one chemical for another.
D. the means by which the characteristics of life are passed on.
The information comes from an article by Robert Wright at Time Magazine Most Important People of the Century.
Write down your answers and then see Answer Key below.

Answer Key: 1-C..........2-A..........3-B..........4-D
Corrections? Questions? Comments? E-mail Robert Jackson at