Immunologist - studies ecology of Legionella pneumophila
Which of the following statements about fungi is true?
All are plants.
Which of the following pairs is mismatched? N
Normal microbiota - harmful
Who proved that microorganisms cause disease?
Which of the following pairs is mismatched? V
van Leeuwenhoek - germ theory
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 statements is false?
Water molecules are formed by hydrolysis.
Which of the following is the type of bond holding K+ and I- ions in KI?
Which of the following is the type of bond between molecules of water in a beaker of water?
What is the type of bond holding hydrogen and oxygen atoms in the H2O molecule?
Identify the following reaction: Glucose + Fructose → Sucrose + Water
Dehydration synthesis reaction
Identify the following reaction: Lactose + H2O → Glucose + Galactose
Which type of molecule contains the alcohol glycerol?
Identify the following reaction: H20+CO2 ⇌ H2CO3
Which molecule is composed of a chain of amino acids?
Which type of molecule contains -NH2 groups?
What structure does light pass through after leaving the condenser in a compound light microscope?
Which of the following pairs is mismatched? G
Gram-negative bacteria - negative stain
Which of the following pairs is mismatched? S
Safranin - acid dye
Which type of molecule is composed of (CH2O) units?
What do genes consist of?
Which are the primary molecules making up plasma membranes in cells?
Identify the following reaction: NH4OH ⇌ NH3 + H2O
The counterstain in the acid-fast stain is
A basic dye.
The purpose of a mordant in the Gram stain is
To prevent the crystal violet from leaving the cells.
Place the following steps in the correct sequence: 1-Staining; 2-Making a smear; 3-Fixing.
In this microscope, the observer does NOT look at an image through a lens.
Place the steps of the Gram stain in the correct order: 1-Alcohol-acetone; 2-Crystal violet; 3-Safranin; 4-Iodine.
In Figure 3.1, line "a." points to the microscope's
In Figure 3.1, line "b." points to the microscope's
The appearance of gram-negative bacteria after addition of the decolorizing agent in the Gram stain.
The appearance of gram-negative bacteria after completing 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?
Which of the following statements about viruses is false?
They have both DNA and RNA.
Which drawing in Figure 4.1 is a tetrad?
Which drawing in Figure 4.1 possesses an axial filament?
Which drawing in Figure 4.1 is streptococci?
Which drawing in Figure 4.1 is a bacillius?
Which of the following structures is NOT found in prokaryotic cells?
In Figure 4.3, which diagram of a cell wall is a gram-negative cell wall?
Which microscope achieves the highest magnification and greatest resolution?
Which of the following is NOT a chemical component of a bacterial cell wall?
In Figure 4.3, which diagram of a cell wall is a toxic cell wall?
Which of the following terms best describes the cell in Figure 4.2?
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 :
Which of the following pairs is mismatched?
Centrosome - food storage
What Gram reaction do you expect from acid-fast bacteria?
In Figure 4.3, which diagram of a cell wall is decolorized by acetone-alcohol?
The purpose of the ocular lens is to
Magnify the image from the objective lens.
The resolution of a microscope can be improved by changing the
Wavelength of light.
Which microscope is most useful for visualizing a biofilm?
Scanning acoustic microscope
In Figure 4.3, which diagram of a cell wall is resistant to many antibiotics (e.g., penicillin)?
Which of the following organelles most closely resembles a prokaryotic cell?
In Figure 4.3, which diagram of a cell wall contains teichoic acids?
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 4.3, which diagram of a cell wall contains porins?
In Figure 6.2, which section shows a growth phase where the number of cells dying equals the number of cells dividing?
In Figure 6.2, which sections of the graph illustrate a logarithmic change in cell numbers?
B & D
Most bacteria grow best at pH
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 is NOT a direct method to measure microbial growth?
Which of the following statements is false?
DNA replication proceeds in one direction around the bacterial chromosome.
Which of the following pairs is mismatched? T
Thermophile - growth at 37°C
In Figure 6.4, in which tube are microaerophiles growing?
In Figure 6.4, in which tube are facultative anaerobes growing?
Which enzyme catalyzes the reaction: O2- + O2- + 2H+ → H2O2 + O2?
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.
A culture medium consisting of agar, human blood, and beef heart is a
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?
Which of the following is the best method to sterilize heat-labile solutions?
Which of the following does NOT achieve sterilization?
Which of the following is NOT used to disinfect water?
Which of the following substances is NOT effective against nonenveloped viruses?
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
DNA is constructed of
Two strands of nucleotides running antiparallel.
Which of the following is NOT a product of transcription?
A new strand of DNA
Genetic change in bacteria can be brought about by