Antibiotic resistance occurs when an antibiotic has lost its ability to effectively control bacterial growth. in other words, the bacteria are “resistant” and continue to multiply in the presence of therapeutic levels of antibiotic. which statement best explains this natural phenomenon in terms of darwin’s theory of natural selection.
a. the antibiotics caused certain groups of bacteria to suddenly start producing enzymes that destroyed the antibiotic before it could harm the bacteria.
b. when an antibiotic is used, bacteria that have a natural variation for resistance to the antibiotic have a greater chance of survival.
c. although susceptible bacteria are killed or inhibited by an antibiotic, any offspring they produced before they died will be resistant to the antibiotic.
d. the need to adapt or die caused some bacteria to become resistant to the antibiotic. this acquired resistance was passed into the future bacteria populations making them resistant.
Answers: 1
Biology, 22.06.2019 20:10
18. determine whether each stateme blank space given. ach statement is true (t) or false (f). place your answer in the 8. when a cell is put into an isotonic solution, individual wat put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. d. when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell. c. when a cell is put into a hypotonic solution, there is a net movement of water molecules across the cell membrane out of the cell. d. the movement of any solvent across a semi-permeable membrane is called osmosis. e. carrier proteins have the ability to change shape and physically move molecules across the cell membrane. f. in facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the cell.
Answers: 2
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