The putative ancestor of animals was:
A. choanoflagellates
B. chytrids
C. gnetophytes
D. stramenopiles
E. euglenozoa
A. choanoflagellates
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A region where old oceanic crust is being destroyed is called:
a. a spreading center. b. a midocean ridge. c. a seamount. d. a subduction zone. e. an atoll.
Which scientist(s) discovered the basis for the
base-pair rule, which states that the amounts of adenine and thymine match, as do the amounts of cytosine and guanine? a. Avery b. Griffith c. Chargaff d. Hershey and Chase e. Pauling
Temperature changes can affect the ability of water to dissolve and keep materials in solution. Which statement below is an appropriate hypothesis concerning water temperature and dissolved oxygen?
A) Lower water temperatures allow for lower concentrations of dissolved oxygen. B) Higher water temperatures allow for higher concentrations of dissolved oxygen. C) Lower water temperatures allow for higher concentrations of dissolved oxygen. D) Water temperatures do not affect the concentration of dissolved oxygen.
Who of the following provided the evidence needed to descredit the concept of spontaneous generation?
A. Pasteur B. Koch C. Semmelweiss D. Lister