Which one of the following characteristics is NOT true for all living cells?
a. All cells are derived from preexisting cells.
b. All cells contain a nucleus.
c. All cells utilize organic fuel molecules as energy sources for their activities.
d. All cells respond to outside stimulation.
e. All cells possess a plasma membrane.
B
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Hfr transfer involves all of the following except
A. a pilus connection between F+ and F- cells. B. high frequency transfer. C. gene integration into the bacterial chromosome. D. F factor is part of the F+ donor chromosome. E. independent plasmid transfer.
As systems biology matured, genomics led to understanding cellular regulatory systems and a new level of metabolic engineering, called ________, such that a microbe could be constructed with novel genetic networks (e.g., rerouting amino acid biosynthetic pathways in E. coli to produce biofuels).
A. functional proteomics B. "parts listing" C. synthetic biology D. metaprotein genetics
Acetylcholine receptors can be differentiated by their ability to be activated by substances such as ________ and ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not a pinniped:
1.seal 2.sea lion 3.walrus 4.sea otter