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Candy is a 13 year old who lives with her father and younger sister. Her mother died when Candy was 6 years old and her sister was 4 years old. Her father works a 12 hour shift full time to support himself and his daughters, and Candy makes sure she […]

In mice, there are viruses that are known to cause cancer. You have a pure preparation of virus DNA, a pure preparation of DNA from the chromosomes of mouse cancer cells, and pure DNA from chromosomes of normal mouse cells. Virus DNA will specifically anneal with cancer-cell DNA, but not […]

First, identify some of the most important elements that compose Earth’s continental crust. Which two seem to be the most important and why? Second, describe some of the physical properties that provide a reliable means to identify common minerals. Also, discuss how certain properties can exhibit a range of characteristics […]

1.) What lands and observations inspired Darwin to develop his theory of evolution? 2.) How does the concept of natural selection explain variations in species descended from a common ancestor? 3.) What was the initial response to Darwin’s Origin of Species in 1859? 4.) What is a vector, and what […]