Evolutionarily, Archaea likely arose ____ Bacteria

a. as a direct result of
b. concurrently
c. before
d. after
e. distinct from


ANSWER: d

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology