Which of the following is an example of a metabolic activity that could be used to measure microbial growth?
A) standard plate count
B) glucose consumption
C) direct microscopic count
D) turbidity
E) most probable number (MPN)
B
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Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. B. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until spring. C. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before winter. D. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through autumn and winter.
What is indirect economic value?
What will be an ideal response?
Isolated and purified hepatitis B virus surface antigen can be used in a(n)
A) inactivated whole-agent vaccine. B) attenuated whole-agent vaccine. C) conjugated vaccine. D) subunit vaccine. E) toxoid vaccine.
In order to take advantage of adoptive cell therapies, the tumor must be biopsied and the tumor infiltrating leukocytes are ________ for reactivity and then cultured ________ prior to being reinfused into the patient
A) mutated; in vivo B) mutated; in vitro C) screened; in vivo D) screened; in vitro