biochemistry-midterm 1

biochemistry-midterm 1 - Name: Biochemistry 446-Midterm 1...

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Name: Biochemistry 446-Midterm 1 March 24 th 2009 Time: 6:00 pm-9:00 pm Lecturer: Cristina C. Clement, Ph.D. 1. Recognize and write the name of the structures presented below; in the case of macromolecules (nucleic acids, polypeptides or sugars), label the individual monomeric units, and the type of chemical covalent bonds that are forming the backbone of the polymer (such as phosphodiester bonds, peptide bonds and glycosidic bonds). 1 CH 2 OPO 3 2 - C CH C C CH 2 OPO 3 2 - NH HO H OH H OH (CH 2 ) 4 Enzyme 6 5 4 3 2 1 + Schiff base intermediate of Aldolase reaction
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2 H C NH 2 O CH 2 H N H OH OH H H O O P O H H OH OH H H O CH 2 N N N NH 2 O P O O - O + N - O nicotinamide adenine esterified to P i in NADP + N icotinamide A denine D inucleotide thiamine pyrophosphate (TPP) N N H 3 C NH 2 CH 2 S C N H 3 C CH 2 O P O P O - O - O - CH 2 H O O + acidic H + aminopyrimidine moiety thiazolium ring
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3 pyridoxal phosphate (PLP) N H C O P O - O O OH CH 3 C H O - + H 2 H O OH H OH H OH CH 2 OH H O H H OH H OH CH 2 OH H O H H H O O H OH H OH CH 2 H H H O H OH H OH CH 2 OH H OH H H O O H OH H OH CH 2 OH H O H O 1 4 6 H O H OH H OH CH 2 OH H H H O H OH H OH CH 2 OH H H O 1 OH 3 4 5 2 glycogen
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2. Recognize the absorption spectra shown in the figure below; based on the table with the indicated extinction coefficient of each amino-acid, label each spectra with the corresponding amino-acid expected to have that spectral characteristics. 4
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Recognize and describe the meaning of each figure below and label each individual chemical structure; respond to the following questions: a) Describe what are the “high energy” compounds (intermediates) and which are their major roles in the metabolic reactions. b) What is the phosphoryl group-transfer potential? c) Label the phosphoranhydride bonds in each structure of a “high energy” compound shown in the figures below. d) Which are the major chemical forces responsible for the “high-energy” character of the phosphoanhydride bonds, such as those found in ATP? Figure 1. Figure 2:
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This note was uploaded on 03/12/2012 for the course CHE 446 taught by Professor Clement during the Spring '12 term at CUNY Lehman.

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biochemistry-midterm 1 - Name: Biochemistry 446-Midterm 1...

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