Earthworms exhibit segmentation, defined as the
a. division of the body into a series of similar segments.
b. presence of a true coelom.
c. difference in size of the male and female.
d. presence of a "head" equipped with sensory organs.
b
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When retinal in bacteriorhodopsin becomes excited, it directly catalyzes the formation of ATP
Indicate whether the statement is true or false.
____ is the process by which researchers identify various types of sequences
Fill in the blank with the appropriate word.
Dictyostelium discoideum is an unusual organism, one that straddles the boundary between the unicellular and the multicellular. Its feeding phase consists of individual amoeba-like cells that move independently, feeding on bacteria by phagocytosis. When the food runs out, cells begin to aggregate into a multicelled structure that migrates toward light. The cells differentiate into a base, stalk, and spores; only the spores survive to colonize a new habitat. Dictyostelium discoideum is which of the following?
a. A protozoa b. An apicomplexan c. An algae d. A diatom e. A slime mold
Which carbohydrate, found only in plants, is indigestible by humans?
a. glycogen b. starch c. glucose d. sucrose e. cellulose