Download Exam 3

Biology 3340
Fall 2008
Name _____________________________________________
Read each question carefully and thoroughly! Follow directions for each section.
(All multiple choice 2 points each )
1.Select one of the following three choices to correctly complete each of the statements (1-9)
given below :
A. Transcription
B. Replication
C. Translation
_____ 1.
_____ 2.
_____ 3.
_____ 4.
_____ 5.
_____ 6.
_____ 7.
_____ 8.
_____ 9.
involves DNA polymerase activity.
involves a transfer of amino acids to an elongating chain.
requires DNA ligase to seal DNA fragments.
is a DNA-dependent RNA synthesis process.
involves releasing factors.
begins with a start codon.
requires a promoter sequence.
produces Okazaki fragments
is a DNA-dependent DNA synthesis process.
Ans: 1. B; 2. C; 3. B; 4. A; 5. C; 6. C; 7. A; 8. B; 9. B.
10. The splitting of glucose commonly occurs by many organisms using the Embden-Myerhof pathway of
glycolysis; however, it is not the only way. Bacteria such as Pseudomonas, Azotobacter and Rhizobium use another
glycolytic pathway called ________ to yield 2 pyruvates, 1NADH, 1NADPH, and a net 1 ATP. ( 2 points each)
A.
B.
C.
D.
E.
glyoxylate pathway
Citric Acid cycle
Calvin-Hill-Benson cycle
Entner-Duoderoff pathway
Pentose phosphate shunt
11. The pentose phosphate shunt serves several purposes for the cell. Which of the following is not one of those
purposes?
A. generates NADPH that is used for reduction reactions in biosynthetic pathways
B. generates ribose-5-P important to nucleotide and nucleic acid structures
C. generates ribulose-5-P for carbon fixation reactions
D. generates erythrose-4-P for aromatic amino acid synthesis and vitamin B6 synthesis
E. generates glycerol for the use in phospholipid synthesis
12. What is NADH?
A. an enzyme
B. part of the electron transport chain
C. a three carbon molecule
D. an electron carrier
13. What is the Kreb's cycle "acceptor" molecule that begins the cycle?
A. Oxaloacetate
B. Isocitrate
C. Citrate
D. Pyruvate
E. alpha keto glutarate
14. Glycolysis ends in the production of………
A. a single molecule of ethyl alcohol
B. a single molecule of pyruvic acid
C. two molecules of ethyl alcohol
D. two molecules of pyruvic acid
15. What are the net end-products from glycolysis fed into the Krebs cycle and electron
transport systems (ETS)?
A. 2 NADH
B. 2 Pyruvate
C. 2ATP
D. 2NADPH
E. A & B.
16. Where does Krebs cycle occur?
A. in the mitochondrial matrix
B. in the cytoplasm
C. in the chloroplast
D. in the inner membrane of the mitochondria
17. Which 2-carbon molecule is produced by the preparatory steps/conversions?
A.
B.
C.
D.
acetyl CoA
FADH
NADH
Oxaloacetate
18. Electron carriers are organized in such a way that the potential energy stored in the first
redox couple is released and used to form ATP. This is known as a(n)…..
A. electron transport chain.
B. enzymatic reduction reaction.
C. enzyme transport chain.
D. electron exchange reaction.
Match the following definitions (19- 23) with the appropriate terms given below ( 10pts):
A. Taxonomy
B. Strain
C. Nomenclature
D. colonies
E. Classification
C
E
B
A
19. The assignment of names to taxonomic groups
20. The arrangement of organisms into groups
21. A population descending from a single organism or pure culture isolate
22 The science dealing with classification
D 23. small masses of bacterial cells
24. Show a schematic representation of how you will break down one molecule of glucose to
water and carbon dioxide releasing energy (10 points).