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Which of the following pairs is mismatched? I
Immunologist - studies ecology of Legionella pneumophila
Which of the following requirements was NOT necessary for Pasteur to disprove spontaneous generation?
Regarding Pasteur's experiments with the S-neck flask, which of the following statements is true?
Any possibility of contamination was removed.
There was air involved.
There was a food source involved.
All microorganisms were killed before beginning.
Which of the following statements about the atom 12/6 C is false?
It has 12 neutrons in its nucleus
Which of the following is the type of bond between molecules of water in a beaker of water?
Identify the following reaction: Glucose + Fructose → Sucrose + Water
Dehydration synthesis reaction
What structure does light pass through after leaving the condenser in a compound light microscope?
The purpose of a mordant in the Gram stain is
To prevent the crystal violet from leaving the cells.
Place the steps of the Gram stain in the correct order:
1-Alcohol-acetone; 2-Crystal violet; 3-Safranin; 4-Iodine.
The appearance of gram-negative bacteria after addition of the decolorizing agent in the Gram stain.
Which of the following is NOT a distinguishing characteristic of prokaryotic cells?
They lack a plasma membrane.
The best definition of osmotic pressure is
The force with which a solvent moves across a semipermeable membrane from a higher to a lower concentration.
By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?
Simple staining is often necessary to improve contrast in this microscope.
Compound light microscope
In Figure 4.3, which diagram of a cell wall has a wall that protects against osmotic lysis?
Both a and b
Assume you stain Bacillus by applying malachite green with heat and then counterstaining with safranin. Through the microscope, the green structures are then counter-stained with safranin. Through the microscope, the green structures are :
You have isolated a motile, gram-positive cell with no visible nucleus. You can safely assume that the cell
Has a cell wall.
In Figure 6.2, which section shows a growth phase where the number of cells dying equals the number of cells dividing?
During which growth phase will gram-positive bacteria be most susceptible to penicillin?
Which of the following is an advantage of the direct microscopic count?
Requires no incubation time
Which of the following statements is false?
DNA replication proceeds in one direction around the bacterial chromosome.
A culture medium on which only gram-positive organisms grow and a yellow halo surrounds Staphylococcus aureus colonies is called a(n)
Selective medium & Differential medium
The initial effect of ionizing radiation on a cell is that it causes
The formation of highly reactive ions.
Which of the following is the best definition of generation time?
The length of time needed for a cell to divide
Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
If you were preparing nutrient agar at home and didn't have an autoclave, what could you use to sterilize the nutrient agar
Pressure cooker at 121°C for 15 minutes
Which of the following pairs is mismatched? R
RNA polymerase - makes a molecule of RNA from an RNA template
Genetic change in bacteria can be brought about by
Conjugation.Transformation. Mutation. Transduction.
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 sense strand of DNA?
If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, the coding for the antisense strand of DNA is
What is the sequence of amino acids encoded by the following sequence of bases in a strand of DNA?
If a frameshift mutation occurred in the sequence of bases shown below, what would be the sequence of amino acids coded for?
Which enzyme would cut this strand of DNA: GCATGGATCCCAATGC?
Which of the following statements about the members of the Kingdom Animalia is false?
They can photosynthesize.
Organism A has 70 moles % G+C, and organism B has 40 moles % G+C. Which of the following can be concluded from these data?
The two organisms are unrelated.
You discovered a unicellular organism that lacks a nucleus and peptidoglycan. You suspect the organism is in the group
Into which group would you place a multicellular organism that has a mouth and lives inside the human liver?
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