________ synthesized urea in the laboratory from inorganic starting materials. Much of what is now called ________ dates from this discovery
Fill in the blank with correct word.
Answer: Friedrich Wöhler; biochemistry
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Which habitat types in the figure above cover the largest area?
A) tropical wet forest plus the ocean neritic zone B) open ocean C) algal beds and reefs plus the ocean neritic zone D) wetlands plus the ocean neritic zone
Which of the following is true of gap junctions?
A. They are holes in the cell wall through which the plasma membrane and endoplasmic reticulum of adjacent cells are connected. B. They are channels in the plasma membrane of plant cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. C. They are channels in the plasma membrane of animal cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. D. They provide points of structural support between adjacent plant cells. E. They provide points of structural support between adjacent animal cells.
Why does yogurt taste sharp?
A) It has not been aged long enough to mellow. B) The taste is from the small amount of alcohol it contains, and alcohol tastes sharp. C) The taste is from the large amount of carbon dioxide it contains, and carbon dioxide tastes sharp. D) The taste is from the lactic acid it contains, and acids taste sharp.
Habitats with the most species in greatest danger of extinction, which can be found in tropical developing countries as well as the coasts of the United States, are called ____.
A. ecoregions B. island habitats C. riparian zones D. biodiversity hot spots E. conservation islands