Which of the following is essential for development of discrete, isolated colonies?
A. assay medium
B. differential medium
C. solid medium
D. broth medium
E. selective medium
Answer: C
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With respect to their life cycles, how are fungal pathogens different than bacterial pathogens?
What will be an ideal response?
Which of the following is a disadvantage of using Bt to control insects?
A. Bt does not accumulate in the soil or in nontarget animals. B. Though not well documented it is possible for horizontal gene flow to introduce Bt genes into other plants. C. The toxin can only be activated in target insects so it is nontoxic to mammals. D. Bt is easily degraded in the natural environment.
While researching the effects of light on chlorophyll synthesis in sorghum, you find that brief pulses of red light stimulates the synthesis of chlorophyll a and b. This would suggest that chlorophyll synthesis is directed by the Pr form of phytochrome.
Answer the following statement true (T) or false (F)
Internal fertilization is more advantageous than external fertilization because:a
internal fertilization permits cross-species fertilization.
b. internal fertilization is more open to chance. c. internal fertilization produces a motile egg. d. internal fertilization increases the life span of gametes. e. internal fertilization provides a protective environment for gamete fusion.