Even though the three domain taxonomic system used in this book is widely accepted, there is a key
relationship between common ancestry domains that is unclear. That relationship is
a. between Archaea and Eukarya.
b. between Archaea and Bacteria.
c. between Bacteria and Eukarya.
d. between Archaea, Eukarya, and Bacteria.
e. whether the three domains all have a common ancestor.
D
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Archaea and Bacteria dominate the upper 100 m of the open ocean while viruses dominate depths greater than 100 m
Indicate whether the statement is true or false.
Which of the following is true of fatty acids?
A) Fatty acids are synthesized by the stepwise addition of three carbon units. B) Unsaturated fatty acids are usually branched. C) Fatty acids with 24 carbons are most common. D) Saturated fatty acids have no double bonds between carbons. E) Laurate is an unsaturated fatty acid.
Compared to a solution of pH 9, a solution of pH 7 is
A. 20 times more basic. B. 20 times more acidic. C. 100 times more acidic. D. 2 times more acidic. E. 100 times more basic.
The mantle in mollusks
a. secretes the shell and protects the animal. b. contains the internal organs. c. functions in obtaining food. d. is involved in movement. e. is composed of calcium carbonate.