Which of the following is true of vitamins?
A) They serve as a major energy source for cells. B) They can serve as enzymes.
C) They can serve as coenzymes. D) They are the main component of enzymes.
Answer: C
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Gierer and Schramm isolated ______ from tobacco mosaic virus and applied it to plant tissue, which caused the same types of lesions that occurred when plants were exposed to intact tobacco mosaic virus
A. RNA B. DNA C. proteins D. capsids
A researcher is interested in studying gene X, but not gene Y, in Drosophila. What does she need to amplify only gene
X from the Drosophila genome?
a. some prior knowledge of the gene X sequence so appropriate primers can be designed b. a heat-stable restriction endonuclease c. restriction endonucleases that cut gene X but not gene Y d. a cloning vector that has multiple antibiotic resistance genes e. a cloning vector that will ligate to gene X but not to gene Y
The vertebral column develops from the ____
a. notochord b. hollow, dorsal nerve cord c. gill slits d. tail e. coelom
Bacteria able to perform the NH4+ + NO2- ? N2 + 2H2O reaction have been discovered in laboratory bioreactors and wastewater treatment systems. Researchers predicted that these bacteria should exist in oceans
They measured the concentration of NH4+, NO2-, NO3-, and O2 in the Black Sea as a function of water depth (M. Kuypers et al. 2003 Anaerobic ammonium oxidation by anammox bacteria in the Black Sea. Nature 422:608-11 ) to determine where in the sea the bacteria might live. Analyzing data presented in the figure above, at what depth would you expect to find the bacteria? (Note: In the figure, different scales are used to show concentrations of NH4+, NO2-, NO3-, and O2.) A) in the top 50 meters B) at a depth of 75 meters C) at a depth of 92 meters D) below 100 meters