Microbiology final

1.

1 point

what is a microbe most likely to synthesize using sulfur?

nucleic acids

lipids

amino acids

carbogydrates

2.

1 point

this enzyme si responsible for relaxing the supercoiling of the DNA strand during replication

DNA polymerase

DNA gyrase

photolyase

DNA ligase

3.

1 point

nosocomial infections are infection that ______

are caused by microorganisms whose reservoir is the nose

contracted by not washing hands

contracted in group settings such as sports teams or prisons

are acquired in hospital setting

4.

1 point

A particular organism found in the ocean dices deep during the day time and rises to the surface during the night. This type of movement could be classified as _____

negative chemotaxis

Positive Chemotaxis

negative photaxis

positive photaxis

5.

1 point

fermentation is very efficient and does not require oxygen

True

False

6.

1 point

what is a disadvantage of the petroff-houser cell counter

it is a slow process

it must be used in conjugation with other methods of counting

it requires a high number of bacteria

it counts live and dead cells

7.

1 point

what is the most frequently used method of counting bacteria

spectrophotometer

serial dilution and viable plate count

pour and spread plate

petroff-house cell counter

8.

1 point

what percentage of bacterial infections involves biofilms?

70%

65%

80%

75%

9.

1 point

in prokaryotes, how many ATP does one molecule of glucose produce in aerobic respiration?

30

32

36

38

10.

1 point

during the lag phase of bacterial growth____________

they are testing their environment and getting ready for multiplication

is the best time to test organisms because they are metabolically active

the organisms are dying just as quickly as they are multiplying

the organisms are dying faster than they are multiplying

11.

1 point

which is not a type of passive diffusion?

group translocation

facilitated diffusion

diffusion

osmosis

12.

1 point

what is the result of thawing a refreezing meat?

it is a great methor of microbial control because it progressively kills organisms that may have begun to grow during the thawing process

you are sumply preserving a growing number of bacteria

13.

1 point

which of the following is NOT a virulence factor?

capsule

flagella

endotoxin

all are

14.

1 point

this group of microorganisms is responsible for the majority of foodborne outbreaks

bacteria

virus

parasites

fungi

15.

1 point

The Hand N antigen spikes used to identify the flu virus are found on the surface of the microbe. Which microscope would you use to see the spikes?

scanning electron microscope

light compound microscope

transmission electron microscope

magnifying glass

16.

1 point

which of the following is not a function of proteins

regulation

structure

membrane transport

immune function

all are

17.

1 point

what criteria does the autoclave need to meet in order to sterilize?

none of these

72C for 15 sec

121c for 15 min at 15psi

170c for 2 hours

18.

1 point

Robert Koch provided the "germ theory" by showing the connection between a "germ" and a disease. Which disease did he associate with a germ?

Anthrax

Tuberculosis

Typhoid Fever

Diptheria

19.

1 point

the classical method of cooking shell fish si to steam them until they open. why would you be concerned about this cooking process?

norovirus can survive temperature as high as 140F and may not be killed during the quick cooking process

the cook forgot to wash his hands for 20 sec

the method mentioned above neglects to mention anything about washing the outside of the shells before cooking

there is no concern shell fish is a delicacy

20.

1 point

how do prokaryotic organisms multiply?

transducction

sporogenesis

binary fission

conjugation

21.

1 point

which protein structure refers to a chain of polypeptides

primary

secondary

tertiary

quaternary

22.

1 point

this string of DNA 3' ATCGTTTAGCATTA 5' would be most likely affected by which method of microbial growth control?

ionizing radiation

halogens

QUATS

UV light

23.

1 point

which fo the following is typically used in mouthwash

triclosan

cetyl pyridinium chloride

antibiotics

benzalkonium chloride

24.

1 point

this substance is incorporated into cutting boards in an attempt to control microbial growth

halogens

hexachlorophene

triclosan

phenols

25.

1 point

Bacterial cell walls are composed of ____ which is made up of NAG and NAM units

peptidoglycan

cellulose

peripheral proteins

phospholipid bilayeer

26.

1 point

organisms being viewed under an electron microscope take less time to prepare than organisms prepared for light microscope.

True

False

27.

1 point

I cause endotoxins. I am only found in the cell walls of bacteria that run pink when gram stained. What am I?

0-polysaccharide

Lipid A

peptidoglycan

lipoteichoic acid

28.

1 point

despite all his scientific contributions this man is recognized for saving the wine industry in france

koch

pasteur

none of them

lister

29.

1 point

Bonds between amino acids are called peptide bonds

True

False

30.

1 point

Which of the following organisms is an Acid Fast?

clostridium tetanil

Mycobacterium tuberculosis

bacillus anthrax

serratia marcescens

31.

1 point

Dehydration synthesis is used in joining ______ to form respective polymers

Monosaccharides

amino acids

water molecules

a and b

32.

1 point

alcohols denature proteins in the cell membrane of microbes, what is the ideal concentration of alcohol for this hydrolytic reaction?

100%

95%

50%

10%

33.

1 point

which of the following is not a characteristic of an enzyme

usually end in -ase

lower the activation energy

made of protein

not very specific, it is a universal catalyst

34.

1 point

if you want to see a ribosome (internal organelle) in a Eukaryotic cell, which microscope would you use?

scanning electron microscope

light microscope

magnifying glass

transmission electron microscope

35.

1 point

lister was the first to use this as a surgical scrub

carbolic acid

tinctures of iodine

tricolsan

halogens

36.

1 point

I am using the oil immersion technique (100x objective lens) in lab on a light compound microscope, what would be the total magnification?

1000X

110x

200x

100x

37.

1 point

which enzyme is essential to synthesize an mRNA strand that codes for a certain protein during transcription

DNA polymerase

RNA primer

okazaki fragment

RNA polymerase

38.

1 point

identify this molecules C6H12)6

carbohydrate

lipid

nucleic acid

protein

39.

1 point

chemicals used to remove bacteria from an inanimate objects are called _________

antispetic

sterilized

none of these

disinfectant

40.

1 point

what is NOT a physical method of removing bacteria?

autoclave

filtration

osmotic pressure

wiping a surface with a hypochlorite solution

41.

1 point

The main unit of measurement is a _____ and is a factor of 10?

centimeter 10^-2

millimeter 10^-3

micrometer (micron) 10^-6

micrometer (micron) 10^9

42.

1 point

DNA polymerase ___________

synthesizes DNA

join DNA strands

repairs damaged DNA strands

joins Okazaki fragments

43.

1 point

what is the method of communication microbes that live in biofilm use?

plasmids

quorum sensing

gap junctions

conjugation

44.

1 point

where would 70 ribosomes be used to synthesis proteins?

Mitochondria

Chloroplast

Streptococcus species

all

45.

1 point

a group of sphere shaped bacteria are arranged in a "grape cluster" like pattern. How would you name this pattern?

streptococci

staphylococci

streptobacilli

diplobacilli

46.

1 point

what size are the pores used in a filter serilization?

02. microns

0.5 microns

0.2 millimeters

0.5 millimeters

47.

1 point

which of the following is not a lipid

triglycerides

sterols

peptidoglycan

waxes

cholesterol

steroids

48.

1 point

what is the main purpose of a streak plate?

to obtain pure cultures

preserve microorganisms

to test what type of sugar it ferments

to test antibiotics

49.

1 point

What role does iodine play in Gram Staining?

Mordant

Primary Stain

Secondary Stain

decolorizing Agent

50.

1 point

this type of microbial control can lead to neurological damage in infants

antibiotics

ampicillin

hexachlorophene

triclosan