Which of the following structures allows a bacterium to propel itself through its environment?

When male moose engage in their annual battles, butting heads with their oversized antlers, they are exhibiting ____

selection.

a. stabilizing b. disruptive c. directional d. intrasexual e. intersexual

passive transport requires metabolic energy

a. true b. false

Some members of the Domain Bacteria have

a. a nucleus. b. membrane-bound organelles. c. chloroplasts. d. photosynthetic ability.

Of the following human aneuploidies, which is the one that generally has the most severe impact on the health of the individual?

A) 47, trisomy 21 B) 47, XXY C) 47, XXX D) 45, X