Which of the following correctly describes exons and introns?
A) Both exons and introns code for proteins, but they code for different types of proteins.
B) Exons are coding sections of DNA and introns are noncoding sections.
C) Exons are noncoding sections of DNA and introns are coding sections.
D) In order to code for a protein both an exon and an intron are necessary.
B
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The revitalization of the blighted Bevo Mill neighborhood in St. Louis was largely engineered by refugees from which nation?
A) Iraq B) Afghanistan C) Syria D) Somalia E) Bosnia
Which one of the following statements concerning foci and epicenters is correct?
a.) The epicenter is at the surface directly above the focus where the earthquake initiates. b.) The focus is the faulted point on the surface directly above the epicenter. c.) The earthquake starts at the focus and the rupture extends down to the epicenter. d.) The fault first cracks at the epicenter and breaks through to the surface at the focus.
What is "dryland" agriculture?
A) agriculture in dry areas, made possible by irrigation B) agriculture that depends largely on seasonal precipitation to support farming C) agriculture that relies on special, hybridized crops that require almost no water D) agriculture that occurs on oases in land that is otherwise desert E) agriculture that occurs in desert lands, inside a greenhouse with a controlled environment
Why does Southeast Asia have such distinctive forms of agriculture?
What will be an ideal response?