Test 2 Review Answers – Flashcards

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question
Which of the following statements about photophosphorylation is false?
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It requires CO2
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A strictly fermentative bacterium produces energy
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By glycosis only
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Which of the following statements about beta oxidation is false?
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B) It involves the formation of 2-carbon units.
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In noncyclic photophosphorylation, O2 is produced from
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H2O
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Which of the following uses CO2 for carbon and H2 for energy?
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Chemoautotroph
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Cyanobacteria are a type of
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Photoautotroph
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Beggiatoa bacteria get energy by oxidizing S2- to S6+. This means they take ___ for their ___.
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electrons; electron transport chain
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The term facilitative anaerobe refers to an organism
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uses oxygen or grows w/o oxygen
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Which of the following is an advantage of the standard plate count?
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Determines the number of viable cells
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Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
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36
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Most bacteria grow best at pH:
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7
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A culture medium consisting of agar, human blood, and beef heart is a:
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Complex medium.
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Which of the following statements define generation time the best?
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The length of time needed for a cell to divide
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Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
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Facultative halophiles
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Patients with indwelling catheters are susceptible to infections because:
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Biofilms develop on catheters.
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Which of the following is the best method to sterilize heat-labile solutions?
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A) Membrane filtration
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Which of the following best describes the pattern of microbial death?
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B) The cells in a population die at a constant rate.
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Which of the following substances can sterilize?
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Ethylene Oxide
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Iodophors differ from iodine (I2) in that iodophors:
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A) Don't stain.
B) Are less irritating.
C) Are longer lasting.
D) Are combined with a nonionic detergent.
E) All of the above. <-----
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Which of the following affects the elimination of bacteria from an object?
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A) Number of bacteria present
B) Temperature
C) pH
D) Presence of organic matter
E) All of the above <----
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Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?
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A) Gamma radiation
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A disk-diffusion test using Staphylococcus gave the following results:
Table 1.



Which compound was the most effective against Staphylococcus?
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C) C
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In Table 1, which compound was the most effective against E. coli?
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E) Can't tell
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Which of the following will NOT destroy prions?
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D) Boiling
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If you were preparing nutrient agar at home and didnt have an autoclave, what could you use to sterilize the nutrient agar?
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A) Pressure cooker at 121°C for 15 minutes
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DNA is made of:
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C) Two strands of nucleotides running antiparallel.
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Which of the following is NOT a product of transcription?
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A) A new strand of DNA
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An enzyme produced in response to the presence of a substrate is called:
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B) An inducible enzyme.
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According to the operon model, for the synthesis of an inducible enzyme to occur, the
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C) Substrate must bind to the repressor.
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Synthesis of a repressible enzyme is stopped by:
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E) The corepressor-repressor binding to the operator.
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In transcription,
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C) DNA is copied to RNA.
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Table 2



If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, what is the order of bases in the template strand of DNAUse Table 2 for reference
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B) 3?- AGACGTTTCAAT
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(Use Table 2) The anticodon for valine is:
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E) CAA
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(Use Table 2) What is the sequence of amino acids encoded by the following sequence of bases in a strand of DNA
3 ATTACGCTTTGC
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D) Transcription would stop at the first codon
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Figure 4


In Figure 4, which model of the lac operon correctly shows RNA polymerase, lactose, and repressor protein when the structural genes are being transcribed?
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D) d
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