Evolutionarily, Archaea likely arose ____ Bacteria
a. as a direct result of
b. concurrently
c. before
d. after
e. distinct from
ANSWER: d
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The central nervous system is lacking in animals that have _____
A) a complete gut B) bilateral symmetry C) radial symmetry D) a closed circulatory system E) excitable membranes
Which of the following is a use for GMOs?
A. chickens that produce eggs containing antibodies to help fight bacteria B. rice that contains vitamin A C. sugar cane with increased sugar content D. corn that is resistant to disease E. All of the answer options are correct.
How did Zhang and Cech purify the RNA molecules that were able to catalyze the linkage between two amino acids?
a. passing the reaction mixture through a column that binds biotin b. passing the reaction mixture through a column that binds all proteins c. passing the reaction mixture through a column that binds RNA d. centrifuging the reaction mixture to concentrate the proteins e. centrifuging the reaction mixture to concentrate the RNA molecules
The tube feet of echinoderms that are used for locomotion, capturing prey, and gas exchange are "inflated" by the ________, which is unique to the echinoderms
A) coelom B) tubular gut C) hemocoel D) water-vascular system E) hydrostatic skeleton