The purple sulfur and green sulfur bacteria
A. both use hydrogen sulfide as a source of electrons.
B. generate oxygen.
C. preferentially use organic molecules as an electron source.
D. both lack gas vesicles.
A
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How many semicircular canals are in each organ of balance?
a. 2 b. 3 c. 4 d. 5 e. more than 6
While working in a soil-testing laboratory, you are given a sample of a "typical" soil to analyze. Which of the following do you correctly conclude is present in the largest amount?
a. water b. inorganic mineral particles c. rocks d. air e. organic material
A prokaryotic cell that contains branched-chain hydrocarbons linked to glycerol belongs to an archaean.
Answer the following statement true (T) or false (F)
Constipation can be caused by all of the following except ____.
A. emotional stress B. a low-fiber diet C. a sedentary lifestyle D. dehydration E. bacterial infections