Biology 140 Exam One VERSION B February 5,2009 Below are 50 multiple choice questions. Choose the answer that best answers the question (2 points each) 1) What principle enables receptor-mediated endocytosis to work? a) protein-to-protein recognition (based on protein tertiary structure). , b) maintenance of membrane fluidity \ c) cell division t d) van der Waals forces e) none ofthe above 2) Which is one of the tenets of the "cell theory" (as it was originally stated)? a) existence of cells is "only a theory" and not necessarily proven b) all cells have DNA c) all organisms are composed of one or more cells d) some organisms are not composed of cells e) characteristics are passed to subsequent generations in discreet units 3) Compartmentalization in cells is necessary for a) efficient cellular metabolism b) homeostasis c) cell specialization d) sub-division of labor e) all ofthe above 4) Which of the following is accomplished by phagocytosis? *fthe nutritive strategy for single celled organisms b) the immune response in animals c)'release of proteins from cells ,"dfmovement of ions through ion channels ") b.d a and b 5)Unsaturatedfattyacidstendto-atthesitesoftheirdoublebonds a) dissolve b) kink or bend $separate d) react with water e) react with ions 6) Whaiis an a(I -4') linkage? a) a linkage between carbon one of an a-glucose molecule and carbon four of the t adjacent c-glucose molecule 7Af alink between a carbohydrate and four proteins Vf a description of the a-helical structure of proteind) a link between a protein and four carbohydrate molecules 7/alype of double bond found in fatty acids
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