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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Cytotoxic T cells have the ability to

A. produce platelets. B. increase erythrocyte production. C. produce antibodies. D. stimulate thrombin. E. destroy pathogens.

Biology & Microbiology