A multicellular organism that has chitin cell walls & absorbs organic material is a(n)
In the name Escherichia coli(in italics), coli (italics) is the
a. Specific epithet
Which of the following is NOT a domain in the three-domain system?
Who proved that microorganisms cause disease?
c. Van Leeuwenhoek
Which of the following is the best definition of biotechnology?
a. The curing of diseases
b. The use of microorganisms in sewage treatment
c. The use of living organisms to make desired products.
d. The development of recombinant DNA technology
e. Bacterial production of foods
You are observing a cell through a microscope & note that it has no apparent nucleus you conclude that it most likely
a. Has a cellulose cell wall.
b. Is part of a multicellular animal.
c. Has a peptidoglycan cell wall
d. Moves by pseudopods.
e. Is a plant cell.
Which of the following groups include members that lack DNA?
Bacteria differ from viruses in that bacteria
a. Have DNA & RNA
b. Can live without a host
c. Are composed of cells
d. All of the above
In figue 3.1, line "a" points to the microscope's
In figure 3.1, line "c." points to the microscope's
Which of the following is NOT equal to 1m?
c. 1,000,000,um (um is the same as micrometers or microns)
Place the steps of the Gram stain in the correct order:
1-Alcohol-acetone; 2-Crystal violet; 3-Safranin; 4-Iodine
Which of the follwing pairs is mismatched for Gram Stain?
a. Crystal violet-primary stain
b. Safranin-acid dye
c. Gram's Iodine-mordant
d. Ethyl Alcohol-decolorizer
The purpose of a mordant in the gram stain is
a. To make the bacterial cells larger.
b. To remove the simple stain.
c. To make gram-negative cells visible.
d. To make the flagella visible.
e. To increase the cells' affinty for a stain & to kill the bacteria.
Simple staining is often necessary to improve contrast in this microscope.
a. Electron microscope
b. Compound light microscope
c. Fluorescence microscope
Which microscope achieves the highest magnification & greatest resolution?
a. Compound light microscope
b. Phase-contrast microscope
c. Darkfield microscope
d. Fluorescence microscope
e. Electron microscope
The appearance of gram-negative bacteria after addition of the mordant in the Gram stain.
The appearance of gram-positive bacteria after adding the counterstain in the gram stain.
What is the total magnification of a bacteria viewed w/a 10x ocular lens & a 100x objective
Which microscope is used to see detail of a 300-nm virus?
a. Fluorescence microscope
b. DIC microscope
c. Phase-contrast microscope
d. Electron microscope
e. Darkfield microscope
The resolution of a microscope can be improved by changing the
b. Find adjustment.
d. Wavelength of light.
e. Coarse adjustment.
Which of the following statements best describes what happens when a bacterial cell is plced in a solution containing 5% NaCl? Hint: Bacterial cells contain less than 5% NaCl.
a. Sucrose will move into the cell from a higher to lower concentration.
b. The cell will undergo osmotic lysis.
c. Water will move out of the cell.
d. Water will move into the cell.
e. No change will result; the solution is isotonic.
By which of the following mechanisms can a cell transport a substance from a lower to higher concentration?
a. Simple diffusion
b. Facilitated diffusion
c. Extracellular enzymes
d. Active transport
Which drawing in Figure 4.1 is a tetrad?
Which drawing in Figure 4.1 is streptococci?
In figure 4.3, which diagram of a cell wall is a gram-negative cell wall?
In figure 4.3, which diagram of a cell wall is decolorized by ethyl alcohol?