Book Principles of Geology, which Darwin read on board the HMS Beagle, argued in favor of which of the following concepts?
A) Earth's surface is shaped mainly by occasional catastrophic events.
B) Meteorite impacts may have been a major cause of periodic mass extinctions.
C) Earth's surface is shaped by natural forces that act gradually and are still acting.
D) The processes that shape Earth today are very different from those that were at work in the past.
Answer: C
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Exceptions to the genetic code have been identified. Which one of the following is a known exception?
A. A codon might not always encode the same amino acid. B. A single stop codon, UGG, may be the only stop codon recognized. C. Alanine codons instead of methionine codons may be used for the initiation of translation. D. The codons in mitochondria are reversed (e.g., instead of AUG, the methionine codon in mitochondria is GUA).
Carbon has an atomic number of 6. Carbon-14 has _____
a. 6 neutrons and 6 protons b. 6 neutrons and 8 protons c. 8 neutrons and 6 protons d. 14 neutrons and 6 protons e. 14 protons and 6 neutrons
what does HBV cause?
What will be an ideal response?
Hox genes determine an animal's
a. body plan b. size c. eye color d. skin color