One difference between prokaryotic and eukaryotic cells is that
A) prokaryotic cells have a nucleus, whereas eukaryotic cells do not.
B) prokaryotic cells have existed on Earth far longer than eukaryotic cells.
C) the DNA of prokaryotic cells is found in linear chromosomes, whereas the DNA of eukaryotic cells is found in a single circular chromosome.
D) eukaryotic cells are generally smaller than prokaryotic cells.
B
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What is the elevation at the bottom of the depression southwest of Pine Hill?
The question is based on this contour line map with elevations shown in feet.
• North is to the top of the map.
• Streams are shown with dashed lines.
• A graphic scale for measuring horizontal distances is shown below the map.
• Estimate elevations between contour lines to the nearest half-contour interval; assume that the top of a
hill is one-half-contour interval higher than the highest contour line shown.
What will be an ideal response?
One of the lasting effects of the Vietnam War is
A. a sense of bonding and friendship between soldiers on both sides of the conflict. B. the residual pollution in the Mekong River. C. the epidemic spread of venereal diseases. D. the barren hill slopes chemically defoliated by American forces.
The most important natural source for the formation of acid for rock weathering at the Earth's surface is dissolved ________.
A. hydrothermal effluent B. seawater C. carbon dioxide D. mantle plumes E. comets
Highly fluid basaltic lava may cool with a smooth, ropy surface called pahoehoe, whereas lower temperature, slower flowing, more viscous basaltic lava commonly has a rough, blocky texture called aa.
Answer the following statement true (T) or false (F)