Describe how the technique of gene therapy might help someone who has an inherited genetic disease as well as future children and grandchildren
What will be an ideal response?
Gene therapy might be able to replace defective genes in the cells and gametes of the individual who has the disease, so that the disease is not fully expressed in that individual or passed on to offspring.
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Which of the following is not a role for methylation?
A. Methylation can protect bacterial RNA from restriction enzymes that are used to destroy viral DNA. B. Methylation of DNA can act as an inhibitor of gene expression. C. Methylation of DNA can enhance binding of certain proteins. D. Methylation is important in directing mismatch repair to repair the correct DNA strand. E. Methylation in eukaryotes can affect the formation of Z-DNA.
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
What characteristic is unlikely to be correlated with coral reefs?
a. develop in warm, clear waters near coasts or tropical islands b. found between 25 degrees north and south c. comprised of wave-resistant formations d. are the least diverse marine ecosystem e. consist primarily of secreted calcium carbonate
As part of your research project, you travel to an island to learn more about the habitats and relationships of flies, spiders, and centipedes. You and your assistant plot out five different areas on the island and count the numbers of flies, spiders, and centipedes living in each plot. Your results show the following: Plot Flies Spiders Centipedes1300254242617103147152147397805791393Based in the information provided, the best explanation for the low numbers of spiders and flies in plot 5 is:
A. centipedes prefer spiders to flies. B. there were not enough flies to support a large centipede population. C. centipedes are actively consuming flies and spiders. D. there were not enough spiders to catch and consume all the flies.