How many DNA base pairs are wound around the histone core of a nucleosome?
A) 47
B) 97
C) 147
D) 197
C
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Which of these factors creates a major problem for scientists studying a particular cycle of glaciation?
a. subsequent glacial advances disrupt sedimentary evidence b. glaciers leave no physical evidence behind c. human activity interferes with past glacial advances d. changes in wind direction e. changes in precipitation patterns
What are the large boulders left behind from a melted glacier that are usually unique from surrounding rocks?
A. glacial erratics B. moraines C. kettles D. glacial till E. glacial flour
Thick sheets of ice advanced over North America as far south as New York as recently as ____
a. ?1816 ("the year without a summer") b. ?1550 c. ?18,000 to 22,000 years ago d. ?1,000 to 2,000 years ago e. ?2 million years ago
Vertical zonation shows that not only do different biomes occur at different latitudes, but also at different ________.
A. right ascensions and declinations B. longitudes C. altitudes D. seasons