Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be to _____
A) determine if they have thylakoids in the chloroplasts
B) test for liberation of O2 in the light
C) test for CO2 fixation in the dark
D) do experiments to generate an action spectrum
B
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The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. parabronchi. C. trachea. D. spiracles. E. alveoli.
Preservatives such as citric acid are added to foods to interfere with bacterial growth. This creates an acidic pH in the food. Why does this affect the bacteria that are present?
A) An acidic environment causes bacterial enzymes to fail or work less efficiently. B) An acidic environment increases the activation energy more quickly in bacteria. C) An acidic environment encourages endergonic reactions in the bacterial cells. D) An acidic environment causes the bacteria to grow more rapidly.
Infection with ________ may result in peptic ulcers and stomach cancer
A) Campylobacter jejuni B) Helicobacter pylori C) Borrelia recurrentis D) Vibrio parahaemolyticus E) Rickettsia rickettsii
As an example of a(n) _____, household bleach can be characterized as having a _____.
A) neutral solution; pH of more than 10 B) base; pH greater than 7 C) base; pH less than 7 D) acid; proton concentration less than 1 x 10-7M