The unique feature of HeLa cells that make them important for research is that they are
a. identical to all other human cells.
b. immortal cells and will grow in culture.
c. limited in growth cycles.
d. identical to stem cells.
e. cannot propagate.
ANSWER: b
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What strategy did Benzer use to perform intragenic mapping?
A. Infection of a cell with two different viruses that had mutations in the same gene could not result in a wild type virus by recombination B. Infection of a cell with two different viruses that had mutations in the same gene would result in a wild type virus by transduction C. Infection of a cell with two different viruses that had mutations in different genes could result in a wild type virus by recombination D. Infection of a cell with two different viruses that had mutations in the same gene could result in a wild type virus by recombination
Which of the following are associated with the binding of numerous signaling molecules and regulating their responses in multi-enzyme complexes?
A) MAP kinase B) 14-3-3 proteins C) growth factor complexes D) alpha-factor E) G-protein activating protein
The Cerulean warbler is a songbird that breeds in the eastern and middle US and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbirds are responsible for the decline of the Cerulean warbler.
B. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance.
C. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance.
D. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance.
E. Brown cowbirds do not appear to affect Cerulean warblers.
Helicobacter pylori causes
A) All of these choices are correct B) Gastritis C) Duodenal ulcers D) Increased risk for cancer E) Stomach ulcers