Which of the following is true of active transport? a In active transport, the cell does not have to do any work as nature moves the materials across the cell membrane.
b The energy used by the cell is in the form of the ADP molecule.
c Molecules called pumps function to control active transport.
d In active transport, the cell must push or pump the molecules from areas of high concentration to areas of low concentration.

Some cells function best at a pH of 5, while others are better at pH 7. ... Cell membranes are semipermeable, meaning they have control over what molecules can ... We call this evening-out moving “downhill”, and it doesn't require energy. ... Transport that directly uses ATP for energy is considered primary active transport.

Explanation:

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;