Which of the following helps activate our innate immune system?
A) active immunity
B) inflammation
C) passive immunity
Answer: B
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Movement of charged molecules in an electrical field, which is used to separate nucleic acid fragments for recombinant DNA work, is called
A. electrophoresis. B. iontophoresis. C. plasmaphoresis. D. nucleophoresis.
Movement of IAA in a shoot tip is as follows: ____
a. IAA initially moves downward from the shoot tip via polar transport. b. IAA initially moves laterally from the shaded to illuminated side of the shoot tip. c. IAA initially moves laterally from the illuminated to shaded side of the shoot tip. d. IAA initially moves laterally in the shoot tip via non-polar transport. e. IAA moves from root tips upwards towards leaves.
Ions diffuse across membranes through specific ion channels down _____
A) their chemical gradients B) their concentration gradients C) the electrical gradients D) their electrochemical gradients
A weak instrument is an instrumental variable:
A. whose distribution is non-normal. B. that suffers from heteroscedasticity. C. whose partial correlation with the outcome is small. D. whose partial correlation with the (endogenous) treatment variable is small.