Midterm_2 2008 answers

Midterm_2 2008 answers - Name(Print Section(TA Cell...

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Name_____________ ____________ (Print) Section (TA)____________________ Cell Structure and Function Midterm#2 February 27, 2008 There are 7 numbered pages to this exam including this one. Please check now to be sure that you have a complete copy. Answer in the space provided. If you use the last page for calculations, be sure to transfer your answer to the correct space. If you feel that your test has mistakes in grading, you may submit the exam for a regrade. You must submit the exam with an attached sheet of paper that indicates what your problem is. I reserve the right to regrade the entire exam, not just the parts in question. Exams must be submitted for regrade by Monday, March 10, 2008. TURN OFF CELL PHONE!!! The following are equations and numeric values you may need for this exam. page 2 ______ page 3 ______ page 4 ______ page 5______ page 6______ page 7______ Total ______ 1
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A. Each question below should be answered in the space provided. For any answer that requires an explanation, for example, the difference between two processes, answer in NO MORE THAN 2 SENTENCES. We will read only the first two sentences . Each question is worth 3 points. 1. What is the source of the energy for substrate level phosphorylation? Hydrolysis of a phosphate from a glycolytic substrate 2. In the following pair, circle the oxidized form. Fe +++ Fe ++ 3. In what molecule is carbon in its most oxidized form? CO 2 4. In gluconeogenesis, most steps involve the same enzymes utilized by glycolysis. Three steps require different enzymes. Name one of these steps and indicate why it needs a different enzyme. The three steps are Glucose-6-Phosphate to Glucose, Fructose 1,6- bisphosphate to Fructose-6-phosphate and pyruvate to PEP. In each case the reverse of the glycolytic reaction would not supply enough energy to recreate the starting reactants. For example, G-6-P hydrolysis does not provide enough energy to make glucose and ATP. 5. Phosphorylation can change the shape of a protein. Indicate one amino acid that can be phosphorylated. serine or threonine or tyrosine 6. If a cold blooded animal such as a lizard is exposed to colder temperatures, it must alter its membrane composition to keep its membranes fluid. Name one alteration that would be useful here. Introduce unsaturations is the best answer,
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Midterm_2 2008 answers - Name(Print Section(TA Cell...

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