In a polar covalent bond,
A) an acid and a base neutralize each other to form a salt.
B) electrons are shared equally between two atoms.
C) electrons are transferred from one atom to another.
D) electrons are shared unequally between two atoms.
E) electrons are shared unequally between more than two atoms.
Answer: D
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Secondary endosymbiosis can occur when a
A) nonphotosynthetic protist engulfs a photosynthetic bacterium. B) virus infects a photosynthetic prokaryote. C) protist evolves to become a prokaryote. D) nonphotosynthetic protist engulfs a photosynthetic protist. E) green alga engulfs a photosynthetic bacterium.
Laboratory research has shown that if a solution containing lipids and proteins is agitated for a long time, then hollow structures called vesicles are produced that resemble ________
Fill in the blank(s) with correct word
Figure 45.11A and B
The images above of a stinging wasp and a nonstinging fly are an example of ____.
A. mimicry B. display behavior C. mimicry and warning coloration D. chemical defenses E. camouflage
Which brain structure plays a central role in homeostasis?
a. thalamus b. hypothalamus c. cerebrum d. brain stem e. cerebellum