The greatest mass extinction of all time, which occurred at the end of the Permian period:a
affected plants living on land more than any other group.
b. was spread out over several million years.
c. resulted in the extinction of more than 90% of all existing marine species.
d. only impacted a few geographic regions, although the impact in these regions was
staggering.
e. did not affect terrestrial species
C
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Chemicals called un-couplers can make membranes permeable to small molecules and ions. What effect might un-couplers have on photosynthesis?
A. Increased ATP production because cyclic electron transport would increase B. Decreased ATP production because the proton-gradient would increase C. Decreased ATP production because the proton-gradient would decrease D. Decreased NADPH production because the proton-gradient would increase E. Decreased NADPH production because the proton-gradient would decrease
Imagine that several thousand years ago, a group of bats and a group of frogs colonized an island at the same time. What can you expect of their current descendants?
A. There will be more frog species compared to bat species. B. There will be more bat species compared to frog species. C. The number of bat and frog species will be equal. D. All frog species will have become extinct on the island. E. All bat species will have become extinct on the island.
Match the following names with the correct phrases.
_______1. Developed vaccines for anthrax and rabies. _______2. Proposed the theory of biogenesis. _______3. Discovered the etiologic agent of plague. _______4. The first person to observe live bacteria and protozoa. _______5. Developed an experimental procedure that could be used to prove that a specific microorganism is the cause of a specific infectious disease. a. Anton van Leeuwenhoek b. Robert Koch c. Louis Pasteur d. Rudolf Virchow e. Alexandre Emil Jean Yersin
Generation time can be defined as the:
a. time required for a bacterial population to double. b. time required for a bacterial population to triple. c. time required for a bacterial population to quadruple. d. half-life of bacteria.