Which of the following amines serve as a building block for the amine bases of DNA and RNA?
A) purine
B) pyridine
C) both a and b
D) neither a nor
A
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In Stage Two of demographic transition, birth rates are high and death rates are declining
Indicate whether the statement is true or false.
Geologists recognize which three major types of plate boundaries?
a. resurgent, divergent, and emergent b. convergent, divergent, and transform c. transcurrent, oblique, and resurgent d. emergent, transform, and convergent e. transform, transcurrent, and translateral
Which of the following is TRUE of CFCs?
A) They are now banned by international treaty. B) They have disappeared in the atmosphere. C) They are very toxic to humans. D) They are not able to exist for long in the atmosphere. E) They are now the most dominant gases in the stratosphere.
Where is the Sahel located? Is this a region of scarce, variable, or abundant rainfall? Describe the biogeophysical feedback mechanism whereby a reduction in surface vegetation might cause a reduction in precipitation amounts.
What will be an ideal response?