What functions can complement proteins perform? (Check all that apply.)
_____ amplify the inflammatory response
_____ attract phagocytes to the site of infection
_____ bind Fc receptors
_____ coat invading microbes
_____ insert themselves into the foreign cell's plasma membrane
_____ provide immunity in response to immunization
_____ store "memories" of specific antigens for months or years
__X__ amplify the inflammatory response
__X__ attract phagocytes to the site of infection
_____ bind Fc receptors
__X__ coat invading microbes
__X__ insert themselves into the foreign cell's plasma membrane
_____ provide immunity in response to immunization
_____ store "memories" of specific antigens for months or years
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In lactation, milk production is stimulated by _______, while milk release is stimulated by ___________.
A. oxytocin, prolactin B. progesterone, oxytocin C. prolactin, oxytocin D. prostaglandin, oxytocin E. progesterone, prolactin
The Gulf Stream takes relatively cold water toward northwestern Europe
Indicate whether the statement is true or false.
Which of the following would not be a study of an organism in its natural environment?
a. a copperhead snake in an eastern deciduous forest b. a fruit fly at a picnic c. a child in a park d. a clown fish in an aquarium e. a lion on the African savanna.
The biological species concept has been widely adopted, but it also has some practical difficulties. Which of the following is not one of these difficulties?
A. The concept is poorly defined. B. The concept cannot be applied to extinct species. C. Many populations are allopatric. D. The concept does not apply to clonal organisms. E. Testing reproductive isolation in the lab is not always feasible.