Where are male cones in gymnosperms?
a. in the highest branches of the tree
b. evenly distributed randomly throughout the tree
c. in the lower region of the tree
d. immediately adjacent to each female cone
c. in the lower region of the tree
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Schleiden and Schwann stated the "cell theory," which in its modern form says:
A. all organisms are composed of one or more cells, all cells require oxygen and all cells arise by division of other cells. B. all organisms are composed of one or more cells, all cells are the smallest living things and all cells arise by division of other cells. C. all organisms are composed of one or more cells, all cells arise spontaneously and all cells vary in size and shape. D. all cells will arise spontaneously, all cells require oxygen and all cells are composed of one or more cells.
A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose, readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. E. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.
How efficient is cellular respiration in extracting the energy stored in the bonds of glucose?
a. 25% b. 33% c. 45%
d. 50% e. 80%
The marsupials in Australia closely resemble the placental animals of the rest of the world. This is an example of
A. the fossil record. B. homology. C. biogeography. D. convergent evolution. E. development.