Which of the following is the infective form of Trypanosoma cruzi?
A) epimastigotes
B) trypomastigotes
C) pseudocysts
D) amastigotes
E) miricidia
B
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The sensing of starvation that leads to sporulation in Bacillus subtilis is accomplished by a ________.
A. quorum regulatory effector B. small RNA C. response regulator D. sensor kinase
Extracellular fluid includes
(a) interstitial fluid. (b) plasma. (c) intracellular fluid. (d) both a and b.
After giving birth, female bighorn sheep lick their newborn lambs. This behavior continues off and on for up to 6 hours, after which mothers no longer lick their lambs. What is/are the ultimate cause(s) of this behavior? Check all that apply.
_____ Hormones released during labor stimulate motor neurons in female bighorn sheep, causing them to lick and groom their lambs. _____ The lamb is stimulated by the licking to begin nursing from its mother and the sooner a lamb begins nursing, the better its chances for survival. _____ Female bighorn sheep remember being licked by their mothers and know they must teach this behavior to their own offspring. _____ Licking the lamb removes excess moisture from its coat, preventing hypothermia. _____ When licking the lamb, the mother learns its unique scent so she can distinguish it from other lambs and offer it protection from predators or extreme weather.
Natural selection is best summarized as
a. mutation in various species. b. independent assortment of genes during meiosis. c. the difference in survival and reproduction in a population. d. changes in chromosome number or structure. e. the adaptation of varying individuals to changes in the environment.