Article: Genes are regulated so that they are expressed only when the product is needed, since expression draws on limited resources.:7 A cell regulates its gene expression depending on its external environment (e.g. available nutrients, temperature and other stresses), its internal environment (e.g. cell division cycle, metabolism, infection status), and its specific role if in a multicellular organism. Gene expression can be regulated at any step: from transcriptional initiation, to RNA processing, to post-translational modification of the protein. The regulation of lactose metabolism genes in E. coli (lac operon) was the first such mechanism to be described in 1961.

Question: What are examples of a cell's internal environment?
Ans: cell division cycle, metabolism, infection status


Article: The driving force behind voluntary green electricity within the EU are the liberalized electricity markets and the RES Directive. According to the directive the EU Member States must ensure that the origin of electricity produced from renewables can be guaranteed and therefore a "guarantee of origin" must be issued (article 15). Environmental organisations are using the voluntary market to create new renewables and improving sustainability of the existing power production. In the US the main tool to track and stimulate voluntary actions is Green-e program managed by Center for Resource Solutions. In Europe the main voluntary tool used by the NGOs to promote sustainable electricity production is EKOenergy label.

Question: What states that EU Member States must ensure that the origin of electricity produced from renewables can be guaranteed?
Ans: RES Directive


Article: A significant portion of historical writing ranks as literature, particularly the genre known as creative nonfiction, as can a great deal of journalism, such as literary journalism. However, these areas have become extremely large, and often have a primarily utilitarian purpose: to record data or convey immediate information. As a result, the writing in these fields often lacks a literary quality, although it often(and in its better moments)has that quality. Major "literary" historians include Herodotus, Thucydides and Procopius, all of whom count as canonical literary figures.

Question: Reporting that attempts a creative or literary bent is sometimes called what?
Ans: literary journalism


Article: Statistics from late 2003 indicate that Apple had 2.06 percent of the desktop share in the United States that had increased to 2.88 percent by Q4 2004. As of October 2006, research firms IDC and Gartner reported that Apple's market share in the U.S. had increased to about 6 percent. Figures from December 2006, showing a market share around 6 percent (IDC) and 6.1 percent (Gartner) are based on a more than 30 percent increase in unit sale from 2005 to 2006. The installed base of Mac computers is hard to determine, with numbers ranging from 5% (estimated in 2009) to 16% (estimated in 2005).

Question: What was Apple's market share in the U.S. by 2006?
Ans:
6.1 percent