1. Which of the following refers to a cellulararrangement of bacterial cells?
a. rods
b. coccus
c. palisades
d. morphology
2. A coccus that divides along two planes of symmetry wouldproduce which arrangement?
a. diplococcus
b. tetrad
c. coccobacillus
d. streptococcus
3. Bacteria that display significant differences in shape, evenwithin the same species, are said to be
a. streptococcal.
b. flexible.
c. pleomorphic.
d. pathogenic.
4. The primary point of staining bacterial cells is to increasethe contrast between the cells and the background.
a. true
b. false
5. A staining technique that results in light organisms againsta darkened background is a
a. Gram stain.
b. simple stain.
c. positive stain.
d. negative stain.
6. Which staining technique would provide the most accurate sizeof a bacterial cell?
a. negative stain
b. Gram stain
c. simple stain
d. All staining techniques would give equivalent results.
7. When preparing a bacterial smear growing on a Petri dish forstaining you would
a. use a loop to transfer an entire colony to the slide.
b. use a needle to transfer a small amount of growth to theslide.
c. use a needle to transfer a small amount of growth to a loopof water on the slide.
d. use a loop to transfer a large quantity of growth to a dropof water on the slide.
8. Which of the following is a differential stain?
a. simple stain
b. Gram stain
9. Microorganisms are commonly found in soil, surfaces, anddust, but not on living surfaces like skin.
a. true
b. false
c. negative stain
d. All are differential stains.
10. The mordant in a Gram stain is
a. crystal violet.
b. Gram’s iodine.
c. ethanol.
d. water
11. If you correctly stain a mixture of Gram-positive rods andGram-positive cocci, you would expect to see
a. purple rods and pink cocci.
b. pink rods and purple cocci.
c. purple rods and purple cocci.
d. pink rods and pink cocci.
12. Draw and label the three most common bacterial shapes.
13. Draw and label cocci growing as diplococci, tetrads,streptococci, and staphylococci.
