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Which of the following reactions produces the most molecules of ATP during aerobic metabolism?
acetyl CoA -> CO2 -> H2O
Which of the following is the best definition of the Krebs cycle?
a series of chemical reactions in which NADH is produced from the oxidation of pyruvic acid
Which of the following is the best definition of respiration?
a sequence of carrier molecules with an inorganic molecue as the final electron acceptor
Which culture produces the most lactic acid?
E. coli growing in glucose broth at 35C without O2 for 5 days
Which of the following is most efective for sterilizing mattresses and plastic Petri dishes?
Which of the following cannot be used to sterilize a heat-labile solution stored in a plastic container?
A classmate is trying to determine how a disinfectant might kill cells. You observed that when he spilled the disinfectant in your reduced litmus milk, the litmus turned blue again. You suggest to your classmate that
the disinfectant might oxidize molecules
Feedback inhibition differs from repression because feedback inhibition
stops the action of preexisting enzymes
Bacteria can acquire antibiotic resistance by
all of the above mutation, insertion of transposons, acquiring plasmids
Suppose you inoculate three flasks of minimal salts broth with E. coli. Flask A contains glucose. Flask B contains glucose and lactose. Flask C contains lactose. After a few hours of incubation, you test the flasks for the presence of b-galactosidase. Which flask do you predict will have this enzyme?
the one that has lactose in it only
Two daughter cells are most likely to inherit which one of the following from the parent cell?
a change in a nucleotide in DNA
Restriction enzymes were first discovered with the observation that
phage DNA is destroyed in a host cell
You have a small gene that you want replicated by PCR. You add radioactively labeled nucleotides to the PCR thermalcycler. After three replication cycles, what percentage of DNA single strands are radiocatively labeled?
All of the following are modes of action of antiviral drugs except?
inhibition of protein synthesis at 70S ribosomes
Which of the following modes of action would not be fungicidal?
inhibition of peptidoglycan synthesis
An antimicrobial agent should meet all of the following criteria except
the production of hypersensitivites
The most selective antimicrobial activity would be exhibited by a drug that
inhibits cell wall synthesis
A drug that intercalates into DNA has the following effects. Which one leads to the others?
It interferes with DNA replication
Chloramphenicol binds to the 50S portion of a ribosome, which will interfere with
translation in prokaryotic cells.
In the above diagram what does S represent, and under what conditions is it produced by the cell?
Signal protein and it is produced by the cell when ...
Inhibitors of protein synthesis interfere with translation on the 50S portion of the 70S bacterial ribosome. Although eukaryotic cells use an 80S ribosome for protein synthesis, the antibiotic can still pose a risk for eukaryotic cells. why?
Because in the mitochondria of eukaryotic cells there are 50S portions of proteins
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