Which of the following is an accurate Internet citation? O A. Delehante, Shane, May 28, 2011: Earth Day Activities. Internet: <
http://www. foundationselementary. org/delehante/earthday >.
B. Earth Day Activities, Shane Delehante: <
http://www. foundationselementary. org/delehante/earthday >.
C. Internet:
http://www. foundationselementary. org/delehante/earthday >,
D. .
Delehante, Shane. Accessed: May 28, 2011.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called