Arthur is testing how well various types of disinfectants can kill e. coli bacteria. he starts with a petri dish that is covered with a colony of e. coli. he puts exactly one milliliter of each different disinfectant at a different location on the petri dish.

if a disinfectant works, it will eliminate the bacteria in the area in which it was placed. two days later, arthur will measure the amount of bacteria that has been cleared out by each disinfectant.

which of the following is a variable in this experiment?

Question 1 which of the following allows cells to take in fluids? a. phagocytosis b. pinocytosis c. exocytosis d. receptor-mediated endocytosis question 2 molecules move along their concentration gradient (from areas of high concentration to low concentration) using active transport mechanisms. a. true b. false question 3 which of the following powers active transport (ie. provides the energy for)? a. glucose b. transport proteins c. atp d. phospholipids question 4 what type of lipid is a major component of the plasma membrane? a. cholesterol b. phosopholipids c. proteins d. triglycerides