MIDTERM 2 (MOL S11) - ANSWERS

MIDTERM 2 (MOL S11) - ANSWERS - V55.0310 NATURAL SCIENCE...

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V55.0310 NATURAL SCIENCE II: THE MOLECULES OF LIFE SPRING 2011 MIDTERM EXAM 2 – ANSWERS Name: ________________________________________________ ID#: ________________________ Lab section and time: ______________________________ Lab instructor: ______________________ Exam Guidelines (1) The exam contains several sections with a specific theme . The allocation of points for the questions within each section is indicated. (2) There are TWO VERSIONS of the exam (A and B), which differ in the order of the sections. (3) Read the questions carefully and ensure that you have answered all parts . Regularly check the time and pace yourself to leave sufficient time for questions at the end of the exam. (4) The exam must be written in pen and not pencil . Any errors should be crossed out and the answer rewritten. The last page of the exam has been left blank for corrections or notes; tell us on the question page if you have used the back page for a revised answer. (5) Some questions have a multiple choice format. For these questions, clearly circle the letter corresponding to your answer . Credit cannot be given for ambiguous answers. Other questions require short written answers or drawings; answer these questions in the space provided. (6) When you have completed your exam, submit the paper according to your laboratory section and sign the exam attendance sheet . Academic Dishonesty Any academic dishonesty during the exam is a serious offense that will result in a grade of F and initiation of academic disciplinary procedures. Question Points Section 1 : Making Macromolecules (20 pts.) Section 2 : From Molecules to Cells (25 pts.) Section 3 : DNA - The Molecule of Heredity (35 pts.) Section 4 : Genetic Information (20 pts.) Section 5 : Protein Architecture (20 pts) TOTAL (120 pts.) PERCENTAGE LETTER GRADE
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SECTION 1: MAKING MACROMOLECULES POINTS: _______ Multiple choice (2 pts each)____________ Question 1.1: How does a centrifuge work to separate a mixture of molecules in a cell? (a) It uses an electric field to separate molecules according to their electrical charge. (b) It uses diffusion to separate molecules according to their mass. (c) It uses increased gravitational forces (e.g., 4 g) to separate molecules by their mass. (d) It uses increased gravitational forces (e.g., 100,000 g) to separate molecules by their mass. Question 1.2: Why is the term “macromolecule ” used to describe certain biological molecules like proteins and DNA? (a) Because they behave according to different chemical rules than non-biological molecules. (b) Because they have molecular masses that are much larger than other molecules. (c) Because they can only function within the environment of the cell. (d) Because they can be observed using an optical microscope. Question 1.3: What polymer did we make together in class using molecular models? (a) polyamide (b) polyester (c) polyethylene (d) polypeptide Question 1.4: Proteins are biological molecules that are composed of polypeptide chains. What type of monomer is used to make a polypeptide?
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MIDTERM 2 (MOL S11) - ANSWERS - V55.0310 NATURAL SCIENCE...

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