What is the function of a cell’s selectively permeable plasma membrane? a) it the cell to manufacture proteins. b) it regulates the amount of atp the cell produces. c) it regulates what materials enter and leave the cell. d) it packages and stores most of the material in a cell.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

20 how are energy cycles and growth cycles related?

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