Watson and Crick were the first to ____________.
A. discover DNA’s double helical structure
B. discover DNA
C. isolate DNA
D. build the first DNA model
E. clone DNA
Answer: D
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Someone who lives next to a bell tower doesn't even notice the chiming of the bells after a while. This is an example of ________
Fill in the blank(s) with correct word
The rigid chitinous exoskeleton of an arthropod has all of the following functions except it
A. prevents injury to the animal. B. impedes water loss. C. provides a place for muscle attachment. D. maintains a uniform size for all individuals of that species. E. protects the animal from predators.
Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a ________ and ________ reproductive barrier
A) mechanical; postzygotic B) behavioral; prezygotic C) temporal; prezygotic D) gametic; postzygotic
Cytotoxic T cells have the ability to
A. produce platelets. B. increase erythrocyte production. C. produce antibodies. D. stimulate thrombin. E. destroy pathogens.