practice exam

Question 0

which of the following mechanisms used to transport substances across the bacterial cell wall requires energy?

Answer 0

active transport

Question 1

in the scientific name, E. coli, coli is the _____

Answer 1

species

Question 2

resolution refers to _________

Answer 2

ability to distinguish two objects as two objects

Question 3

which of the following is the same size as 1 um bacterial cell

Answer 3

1000 nm mitochondria

Question 4

place the parts of the compound light microscope in the order that light passes through them on the way to the observer’s eyes: (1) condenser, (2) ocular lens, (3) illuminator, (4) specimen, (5) objective lens

Answer 4

3-1-4-5-2

Question 5

heat fixing is important when preparing stains because it

Answer 5

adheres the cells to the slide

Question 6

the following types of microorganisms are correctly matched except:

a. bacteria-prokaryotic
b. fungi-eukaryotic
c. archaea-eukaryotic

Answer 6

C

Question 7

the first observations of microorganisms were made in the 17th century by

Answer 7

van Leewenhoek

Question 8

all of the following are functions of the prokaryotic glycocalyx EXCEPT:

a. protection from phagocytosis
b. attachment to environmental surface
c. protection against dehydration
d. toxicity to humans

Answer 8

D

Question 9

when using a compound light microscope, a 2 um bacterial cell is BEST seen at which magnification?

Answer 9

1000x

Question 10

from the following list, select the ingredient that would make a medium complex

Answer 10

peptone

Question 11

all of the following statements are true about gram positive cells compared to gram negative cells except:

a. gram + cells have more peptidoglycan
b. gram + cells are sensitive to penicillin
c. gram + cells are decolorized by alcohol
d. gram + cells possess teichoic acids

Answer 11

C

Question 12

which of the following statements about bacteria is not true?

a. essential to the prescence of life on earth
b. used to make some foods and drinks
c. everyone has bacteria in and on the body
d. the only good bacteria is a dead bacterium

Answer 12

D

Question 13

Spallanzani designed experiments to disprove spontaneous generation. Needham’s argument against these experiments was that

Answer 13

heating had weakened the vital force necessary for life

Question 14

pseudomurein is found in the cell walls of ____

Answer 14

archaea

Question 15

all of the following are true about endospores except they:

a. are resistant to heating, desiccation, and chemicals
b. form under adverse conditions
c. do not survive very long in the environment
d. evolved as adaptations very early in evolutionary time

Answer 15

C

Question 16

what type of microscope would you use to study the internal structures in living eukaryotic cells?

Answer 16

phase-contrast

Question 17

the laboratory procedures employed to prevent microbial contamination are called

Answer 17

aseptic techniques

Question 18

which of the following is the correctly written scientific name?

a. Paramecium Caudatum (italized)
b. Paramecium caudatum
c. paramecium caudatum
d. Paramecium caudatum (italized)

Answer 18

D.

Question 19

which of the following statements is the best definition of spontaneous generation

Answer 19

nonliving matter gives rise to living organisms

Question 20

the gram stain is a differential staining technique that takes advantage of differences in the

Answer 20

thickness of peptidoglycan in the cell wall

Question 21

when you introduce microorganisms to a growth medium, this is termed ____

Answer 21

inoculation

Question 22

which cell wall component renders some microorganisms impermeable to most stains?

Answer 22

mycolic acid

Question 23

Escherichia coli stains ____

Answer 23

gram negative