What component is located on the exterior surface of a prokaryote?
a. flagellum
b. cytoplasm
c. plasma membrane
d. DNA
e. nucleoid
ANSWER: a
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Betapropiolactone is not as useful as ethylene oxide as a sterilizing agent because it does not penetrate materials as readily as ethylene oxide.
Answer the following statement true (T) or false (F)
You and a friend are student assistants in a research laboratory that investigates the anti-cancer properties of proteins isolated from marine organisms. Your friend mentions that she is using a BAC vector to insert shark DNA into Escherichia coli, but after repeated attempts, has found that the bacterial cells fail to synthesize the encoded protein. What is your advice?
A. Since shark DNA is eukaryotic, the cloning vector should be a YAC derived from yeast rather than a BAC derived from bacteria. B. If the shark DNA is unmodified, it contains introns that are not recognized by bacteria, therefore protein synthesis will not occur. C. It is impossible to clone eukaryotic DNA into a bacterial host, since eukaryotic DNA has introns and prokaryotic DNA does not. D. Because Escherichia coli is not naturally competent, it cannot serve as the cloning host for foreign DNA.
Answer the following statements true (T) or false (F)
1. The diversity-stability hypothesis supports the idea that pest outbreaks are less likely on cultivated land. 2. MacArthur and Wilson's island biogeography would predict that there would be more species in North America than in Greenland. 3. The productivity hypothesis would predict that there would be more species in North America than in the Amazon. 4. A metagenomic library is a typical tool of analyzing the flowering plants in a forest community.
Which of the following do most neurons have that other cells do not?
a. Lipid membrane b. Soma c. Nucleus d. Dendrites