Which of the following is suggestive that mitochondria may have been an ancient entity?
A) Mitochondria produce energy
B) Some exceptions to the genetic code are found in mitochondrial DNA.
C) Mitochondrial DNA is passed only through the female line.
D) None of the above is correct.
B
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Is the following transformation representative of a physical change or a chemical change?
A. chemical change because the atoms are connected differently B. physical change because of a change in phase C. physical change because a new material has been formed D. chemical change because of the formation of elements
The strongest horizontal temperature gradients within a hurricane occur
A) in the eye. B) in the eyewall. C) in the spiral rain bands. D) at the outer edges of the storm.
Which of the following statements is most correct regarding the origins of geography?
A) Geography was invented as a science in the late eighteenth century. B) Physical geography has been studied since ancient times, but human geography was first studied in the twentieth century. C) Geography owes its existence to the Renaissance period in Western Europe. D) Humans have practiced geography at least since the time of ancient Greek civilization. E) Human geography was not practiced until powerful computers capable of mapping detailed information were invented.
Which of the following is not a primary factor contributing to sea-level rise?
A) melting of glaciers B) melting of ice sheets C) melting of sea ice D) thermal expansion of seawater