Thought question
What will be an ideal response?
In E. coli, genes coding for membrane transport proteins are regulated by ?H, as well as housekeeping ?D, extracytoplasmic stress ?E, flagellar ?F, nitrogen limitation related ?N, and starvation-induced ?S.
If each sigma factor recognizes a different promoter, how does the cell manage to transcribe these membrane transport protein genes that respond to multiple stresses, each involving a different sigma factor?
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Some algae utilize calcium carbonate to:
a. deter herbivores. b. aid in maintaining a proper pH balance. c. assist in photosynthesis. d. replace mucus. e. prevent from freezing.
what membrane disrupting exotoxin secreted by Staph aureus cause leukocyte lyses?
What will be an ideal response?
In the phalarope, or wadepiper bird, the male is unusual in playing the larger parenting role -- he performs all the egg incubation and chick care. What unusual behavior might you predict for the female of the species?
A. The female is part of a large harem of females, under the domain of a single male. B. The female provides sperm to fertilize the male's eggs. C. The females have dull, brown coloring that keeps them well-camouflaged. D. The females compete to mate with the males, who choose among them.
Cells such as those of golden algae that form stable associations but do not take on specialized roles are described as:
A) colonial multicellularity. B) selective multicellularity. C) true multicellularity. D) incomplete unicellular.