Explain why the presence of many Archaea has been confirmed only by community sampling of rRNA genes and not by culture in the laboratory. How has metagenomics helped to solve this problem?
What will be an ideal response?
Answer: Due to the extreme environmental conditions Archaea thrive in, some have been difficult to replicate in the lab. Others might not grow in the lab due to the lack in understanding of essential growth factors or metabolism for a particular archaeon to grow. The plating anomaly is just as much of an issue for culturing Archaea from the environment as it is for Bacteria. Metagenomics has allowed us to piece together the genomes of Archaea from the environment to better predict the metabolism and growth factor requirements of uncultured microbes.
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During _______, RNA polymerase synthesizes a molecule of RNA using DNA as a template.
A. mRNA splicing B. translation C. transcription D. gene sequencing E. termination
Which of the following has no effect on the outcome of the host-parasite relationship?
A. The virulence of the parasite B. The number of parasites on or in the host C. The defenses of the host D. All of the choices are correct.
One possible reason for the lack of a nucleus in sieve-tube cells may be that the nucleus would:
A. impede bulk flow B. cause the cell to die C. pass through the plasmodesmata and disrupt bulk flow D. cause the cell plate not to form E. interfere with bulk flow in the xylem
At rest, a cell has a ________ charge inside the plasma membrane and a ________ charge outside the plasma membrane
Fill in the blank with correct word.