Streptomyces bacteria are responsible for the production of an "earthy" aroma (often after a rain), which is due to the metabolites they make that are collectively called
a. butylated ethers.
b. geosmin.
c. loam.
d. tannins.
Answer: B
You might also like to view...
Why might it be more difficult to prepare a vaccine against noroviruses than against rotaviruses?
A. We haven't been able to culture noroviruses in a lab setting yet. Without a starting culture, we can't create a vaccine. B. Noroviruses are RNA viruses, where rotaviruses are DNA viruses. RNA viruses mutate far more easily than DNA viruses, so we COULD make a vaccine, but it would be rendered useless fairly quickly as the virus mutates. C. We lack a proper culturing method for large-scale production of target cells for norovirus, whereas we have such a system for the target cells of rotaviruses. Without a system to get large numbers of target cells, we can't produce a vaccine. D. Norovirus is much more infectious than rotavirus. As such, it's much harder to work with safety. This makes production of a vaccine too dangerous and unpredictable
The structure labeled "C" in this figure of a replication fork represents ____
a. single-stranded binding protein b. primase c. DNA ligase d. helicase e. DNA polymerase
In which of the situations below would a plant be at greatest risk for the formation of air bubbles in the xylem stream?
A. during the night, when transpiration is low B. during the afternoon, when transpiration is highest C. in the early morning, with cooler temperatures and calm winds D. in the day during a drought E. the risk is the same at any time of day
It is estimated that 4.6% of SNPs and about 17% of all genes can be defined as pleiotropic. Based on this finding, which of the following should a consumer of genetic information keep in mind?
A) A test identifying a gene for a disease might actually be a test for a different disorder instead. B) Any variant that we gain information about might in the future be found to associate with a more stigmatizing condition. C) A physician might be treating the major condition but not notice even more deleterious outcomes. D) The classification of my genetic disorder might be incorrect. E) Sequencing of the candidate gene might find the wrong expected functional significance.