In the endosymbiosis theory, what benefit did the host cell receive from the symbiont?
a. protection
b. immune response
c. energy
d. cytoskeletal elements
c. energy
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Carotenoids are important to many plants because these pigments are able to
A. remove carbon dioxide from the air. B. absorb wavelengths of light that neither chlorophyll a nor b can absorb. C. absorb water so that hydrolysis can be carried out in the chloroplasts. D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. E. store electrons for use during the "dark" reaction of photosynthesis.
This arthropod has four pairs of walking legs,
no antennae, and is venomous. This arthropod is ___.
a. a scorpion b. a tick c. a barnacle d. a bee e. more than one of these
Which of the following eye disorders is NOT necessarily correlated with age?
a. cataracts b. macular degeneration c. trachoma d. glaucoma e. the need for bifocal lenses
Which association is incorrect
A) mouth- starch digestion B) esophagus - protein digestion C) small intestine - starch, lipid, protein digestion D) stomach - food storage E) liver - production of bile