31.  Which of the following microorganisms would find hypotonic conditions most detrimental?  
A.  Bacteria
B.  Protozoa
C.  Fungi
D.  Algae
E.  Cyanobacteria

32.  Which of the following require the cell to use ATP?  
A.  Facilitated diffusion
B.  Diffusion
C.  Endocytosis
D.  Osmosis
E.  None of the choices are correct

33.  Contractile vacuoles are  
A.  Used to expel excess water from cells
B.  Found in bacterial cells
C.  Important to certain organisms in hypertonic environments
D.  Protein carriers in cell membranes
E.  Used to bring solutes into a cell

34.  Nutrient absorption is mediated by the  
A.  Cell wall
B.  Peptidoglycan layer
C.  Proteins in the periplasmic space
D.  Cell membrane
E.  Nuclear membrane

35.  Halobacteria regulate osmotic pressure by  
A.  Releasing salt to the environment
B.  Absorbing salt from the environment
C.  Excluding salt from the environment
D.  Changing their cell wall to provide additional osmotic protection
E.  None of the choices are correct

36.  Facilitated diffusion is limited by  
A.  Substrate concentration
B.  Carrier proteins in the membrane
C.  Size of the pores in the membrane
D.  Osmotic pressure
E.  The size of the cell

37.  When whole cells or large molecules in solution are engulfed by a cell, this endocytosis is specifically termed  
A.  Pinocytosis
B.  Phagocytosis
C.  Facilitated transport
D.  Facilitated diffusion
E.  Exocytosis

38.  Mediated transport of polar molecules and ions across the plasma membrane utilizes a _____ _____ that will bind to the substance effecting a conformational change that allows movement across the membrane.  
A.  Protein carrier
B.  Lipid carrier
C.  Porin carrier
D.  Enzyme carrier
E.  All of the choices are correct

39.  In _____ conditions, the cell wall will help prevent the cell from bursting.  
A.  Hypertonic
B.  Hypotonic
C.  Isotonic
D.  Mesotonic
E.  All of the choices are correct

40.  Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37? C incubator and on the shelf of a 50? C incubator. After incubation, there was no growth at 37? C and 50? C, slight growth out on the bench top and abundant growth at refrigeration. What term could be used for this species?  
A.  Halophile
B.  Mesophile
C.  Anaerobe
D.  Psychrophile
E.  Capnophile