test_2b_key - This exam has multiple choice questions (66%)...

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This exam has multiple choice questions (66%) and short answer questions (33%) Please read the exam over before starting. When answering questions, read them carefully and make sure you answer the question being asked, rather than some other question. Always think before you write. Be sure that you put your name and section number and student number on the scantron. THIS IS TEST FORM B. FILL IN THE APPROPRIATE BUBBLE ON THE SCANTRON. Also, be sure that you put your name and section number and student number on the last 2 pages of the exam; these will be separated from the rest of the exam for grading. This test is to reflect your work only . As a student at UC Davis, you are assumed to be familiar with, and have agreed to a code of conduct. This code forbids: Receiving or providing unauthorized assistance on examinations or using unauthorized materials during an examination Plagiarism - using materials from sources without citations or altering an exam and submitting it for re-grading If you are found to be in violation of this code, you will be referred to Judicial affairs. This beautiful structure is a cartoon representation of an enzyme, nitrite reductase from the bacterium Achromobacter cyclastes . All the amazing things that life does—eat rocks, breath arsenic, use water and light and CO2 to make sugar, grow and reproduce—are catalyzed by enzymes. This enyme allows Achromobacter to respire using nitrite. There’s beauty in the phosphorescence of Gonyaulax , but there’s also beauty in the structure, encoding, and regulation of enzymes. The beauty is more apparent to the biologist than the poet, but hopefully you can start to see it. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture.
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1. The enzyme on the cover of this test consists of three polypeptide chains. Thus, the overall shape of the enzyme is best described by its a) primary structure b) secondary structure c) tertiary structure d) quarternary structure—this describes the structure of an enzyme with >1 polypeptide 2. This enzyme, nitrite reductase, is involved in using nitrite (NO 2 - ) as an electron acceptor for respiration. You would expect that a cell would produce less of this enzyme in the presence of a) oxygen—oxygen is the preferred electron acceptor for respiration b) a good electron donor, such as H2 c) high levels of glucose d) high levels of pyruvate e) high levels of ADP 3. This type of nitrite reductase depends upon 6 copper atoms to do its job (the Cu atoms are solid dots in the structure on the front). For nitrite reductase, copper is a a) vitamin b) ribozyme c) cofactor d) intron e) amino acid 4. One of the big concepts of biology is that, for the most part, everything about an enzyme is encoded in an organism’s genes. How does that copper atom end up in Achromobacter ’s nitrite reductase? a) there is a tRNA that is specific for copper
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test_2b_key - This exam has multiple choice questions (66%)...

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