Which of the following is associated with the specific defenses of the body?
A) cell-mediated immunity
B) phagocytosis
C) interferons
D) the inflammatory response
E) the complement system
A
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Which is an example of an obligative response to an environmental factor?
1.Lizards basking in the sun more often at higher altitudes then at lower altitudes 2.Hummingbirds going into torpor at night when the temperature drops 3.Triggering of flowering by warming temperatures in the spring
Which of the following terms is used to label the rhythmic changes in sympathetic and parasympathetic activity that affect heart rate coincident with respiration?
A) pulmonary sinus arrhythmia B) respiratory sinus rhythmia C) respiratory sinus arrhythmia D) lung sinus rhythmia E) pulmonary sinus rhythmia
Which of the following cells is living but their nuclei are lost during maturation?
A. guard cells B. companion cells C. meristem cells D. collenchyma E. sieve cells
After estimating a probit model for the likelihood of a website visitor clicking through conditional on if the visit occurred on a weekday or not, you get the following results: ClickThroughi = -1.2(0.4) + 0.8(0.2)WeekDayi, where standard errors are reported in parenthesis. What would be the calculation that yields the marginal effect of a visit moving from a weekend to a weekday on click-throughs?
A. ?(-1.2 + 0.8) - ?(-1.2) B. -1.2 + 0.8 = -0.4 C. ?(-1.2) D. 0.8