Although Watson and Crick are credited with the discovery of the structure of DNA, they based this discovery on the

bench work of many other scientists of the time. Name at least three different pieces of knowledge that Watson and Crick
used in their discovery that was based on work from other scientists.



What will be an ideal response?


ANSWER: Scientists had previously determined that DNA was made of four components: adenine,
cytosine, guanine, and thymine. Chargaff had shown that the amounts of A and T were
always equal and that the amounts of C and G were always equal. Rosalind Franklin
produced an X-ray diffraction image, indicating that DNA formed a double helix structure.

Biology & Microbiology

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Which of the molecules is polar and acts like a base?

A. R-NH2 B. R-CO-R C. R-OH D. R-PO4 E. R-SH

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Dominance is not consistent with blending inheritance

__________________ Indicate whether the statement is true or false.

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The sequencing method that cuts the DNA of an entire chromosome into small fragments and then clones these fragments is called

A. shotgun sequencing. B. clone-by-clone sequencing. C. consensus sequencing. D. RFLP sequencing.

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The respiratory center is directly sensitive to the levels of H+. Could one correctly say that CO2 levels control the breathing rate? Explain your answer.

What will be an ideal response?

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