Why are cloning vectors preferred over expression vectors for initial cloning of a gene?

A cDNA library would be most useful for a researcher studying __________.

Saudi Arabia is a wealthy nation in the middle east. Much of the country is a desert, owing to its dry, arid climate. What kind of water scarcity does Saudi Arabia experience? 

True or False: transformation is an inefficient process and relatively few cells actually take up exogenous DNA.

Describe how the United States can experience water abundance, physical scarcity, and economic scarcity at the same time. 

Are you aware of anyone else who has cheated on this test? 

What cause-and-effect relationships are described in the situation above? 

The continuous range of mountains that passes through all of Earth’s oceans is the ____. 

The continuous range of mountains that passes through all of Earth’s oceans is the ____. 

What is the source of energy that drives the water cycle?