Behavior can be defined as the way an animal responds to a(n) ________ in its environment.
Fill in the blank(s) with the appropriate word(s).
stimulus
Behavior can be defined as the way an animal responds to a stimulus in its environment.
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____ molecules pass through a cell membrane most easily by diffusion
a. ionic b. large, polar c. large, hydrophilic d. small, hydrophobic e. large, hydrophobic
What structure divides the eye into anterior and posterior chambers?
A. lens.
B. retina.
C. cornea.
D. iris.
E. optic disc.
Class I MHC molecules are essential for
A) presentation of endogenous antigens. B) recognition of chemokines. C) detection of IL-2. D) recognition of class II MHC. E) presentation of exogenous antigens.
Which of the following is a characteristic of most eudicots?
a. Trisulcate pollen b. Scattered vascular tissue c. Parallel veins in leaves d. One cotyledon