Living organisms are members of all of the levels
listed below; however, rocks are components of
a. the community.
b. the population.
c. the ecosystem.
d. the biosphere.
e. both the ecosystem and the biosphere.
Answer: e
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Using Northern and Southern blot techniques, you study a gene, CAE1, that seems to be associated with lung cancer. Your probe in both blots is a 32P-labeled single strand DNA that can base pair with the CAE1 RNA and with the CAE1 gene
You isolate DNA and RNA from brain, heart, lung, and cancerous lung tissue. The DNAwas cut into DNA fragments with a restriction endonuclease before electrophoresis. The results of the blots are shown here. Which one of the following is an observation or conclusion consistent with the data? A. There are fewer CAE1 genes in brain tissue compared to heart tissue. B. The DNA sequence of the CAE1 gene in lung cancer cells is different than in other tissues. C. The amount of CAE1 RNA in lung cancer cells is higher than in other tissues. D. The amounts of all RNAs in heart cells and normal lung cells are the same. E. Deleting the CAE1 gene in all tissue types would be a possible cancer cure with little or no side effects.
Which of the following is(are) true about the DNA of a zebrafish that glows in the dark
because its DNA contains and expresses the firefly gene for bioluminescence?
a. It has recombinant DNA. b. Its DNA has mutated. c. It has evolved. d. The DNA contains a bacterial plasmid.
Which statement is false about intact neurons?
a. An action potential can be generated in an input zone only. b. A trigger zone has enough sodium gates to initiate an action potential. c. Each portion of a membrane has its own recovery time. d. The potassium gates open during the recovery period. e. Gated sodium channels are inactivated during the recovery period.
While studying the plant Arabidopsis, a botanist finds that an RNA probe produces colored spots in the sepals of the plant. From this information, what can be inferred?
a. The differently colored plants will attract different pollinating insects. b. The RNA probe is transported only to certain tissues. c. The colored regions were caused by mutations that occurred in the sepals. d. The RNA probe is specific to a gene active in sepals. e. More research needs to be done on the sepals of Arabidopsis.