When the immune system improperly turns against the body's own molecules, the result is ________
A) an allergy
B) AIDS
C) an autoimmune disease
D) an immunodeficiency disease
C
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According to one hypothesis, how is water tension in the leaves maintained to pull water up the xylem?
A. Water is pulled by capillary action into spaces in between the cell wall, much like a sponge. B. Water is pulled up through the xylem due to capillary forces. C. Water exits the stomata due to capillary forces. D. Water is pushed up the xylem due to high water pressure from the roots. E. Water is pushed down from the leaves to the roots during hot sunny days.
Xanthophyll is a pigment found in plants that helps protect the photosynthetic protein D 1 from:
A. water reactions B. chlorophyll C. damage by high temperatures D. damage by excess light energy E. membranes
In the Watson–Crick model of DNA structure, the polynucleotide chains ____
a. are of unequal length b. are arranged with the bases forming the backbone of the helix c. form covalent bonds between uracil and adenine d. are oriented in the same direction e. are oriented in opposite directions
A population of mice shifting from light-colored coats to darker coats is displaying the effects of _____ selection
A. Artificial B. Disruptive C. Directional D. Sexual E. Stabilizing