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 someone
else.
What will be an ideal response?
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 picture
indicating that DNA formed a double helix structure.
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A fetus is
(a) a newborn pig. (b) a newborn human. (c) an unborn mammal. (d) all of the above.
A drug that inactivates acetylocholinesterase
a. stops the release of ACh from presynaptic endings b. prevents the attachment of ACh to its receptor c. increases the ability of ACh to stimulate postsynaptic cells d. all of these are correct
The mitotic spindle is responsible for organizing and sorting the ________ during cell division.
Fill in the blank(s) with the appropriate word(s).
A(n) ________ is a virus that infects bacterial cells
A) virion B) prion C) bacteriophage D) nucleocapsid E) envelope