Question 1

Streptococcus mutans one of the bacteria that can cause the loss of tooth enamel in humans.The metabolic process that this particular species of bacteria uses that can result in enamel breakdown is

Accepted Answer

A)  ferment sugar into lactic acid,which increases the pH of the mouth causing loss of calcium from the enamel of the teeth.
B)  ferment sugar into lactic acid,which decreases the pH of the mouth causing loss of calcium from the enamel of the teeth.
C)  ferment sugar into lactic acid that attacks the tooth enamel directly and causes dental carries.
D)  ferment sugar into lactic acid,which decreases the amount of calcium that can be absorbed by the teeth from the diet.E) B) and D)
F) A) and B)

Question 2

A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria.This means that she is studying a region within the bacterium that contains the

Accepted Answer

A)  nucleic acids.
B)  nuclear membrane.
C)  R plasmids.
D)  peptidoglycan.E) B) and D)
F) All of the above

Question 3

Which of the following statements about tuberculosis (TB) is false?

Accepted Answer

A)  MDR TB is more expensive to treat.
B)  Not completing a full course of antibiotic can select for MDR strains.
C)  HIV and TB can be transmitted in the same manner.
D)  The spread of TB can be very rapiD.
E)  The reservoir of TB is humans and no vector is required for transmission.F) A) and B)
G) B) and C)

Question 4

In all of the following characteristics,prokaryotes differ from eukaryotes except in

Accepted Answer

A)  cell size.
B)  multicellularity.
C)  chromosomes.
D)  nucleic acids as the hereditary material.
E)  organelles.F) B) and D)
G) B) and C)

Question 5

Tuberculosis remains a serious worldwide health problem due to all of the following except

Accepted Answer

A)  multi-drug resistance.
B)  social factors such as crowding and incarceration.
C)  the prevalence of HIV infections.
D)  ease of transmission.
E)  absence of MDR strains.F) B) and D)
G) A) and B)

Question 6

When bacteria are exposed to nutrient-poor conditions,they form thick-walled structures that contain the chromosome and a small amount of cytoplasm.These structures are called

Accepted Answer

A)  plasmids.
B)  pseudomonades.
C)  nucleoids.
D)  endospores.
E)  exospores.F) B) and C)
G) A) and E)

Question 7

If left untreated,syphilis infections go through four stages.The first stage is a sore called a chancre.The signs of the second stage are

Accepted Answer

A)  some nerve damage,loss of some teeth,and perhaps a dimming of color vision.
B)  very few,with many victims having no symptoms.
C)  rashes that may cover the entire body,sometimes a sore throat,and general aches and pains that appear to be flu-like.
D)  persistence of the chancre and bleeding at the chancre site.
E)  a yellowish-white discharge from the urethra.F) A) and B)
G) B) and D)

Question 8

Sexually transmitted diseases include all of the following except

Accepted Answer

A)  gonorrheA.
B)  syphilis.
C)  chlamydia.
D)  herpes.E) A) and C)
F) C) and D)

Question 9

Which of the following statements about bacterial conjugation is false?

Accepted Answer

A)  F+ cells have an F plasmid;F- cells do not.
B)  Rolling circle replication of the F plasmid produces a double-stranded copy of the plasmid.
C)  The replicated plasmid passes through a conjugation bridge called a pilus.
D)  A cell with an F plasmid integrated into its main chromosome is called an Hfr cell.
E)  The F plasmid contains an origin of replication and genes that control transfer.F) A) and D)
G) A) and E)

Question 10

A microbiologist is conducting a research project on chemoautotrophs.This means that the investigator is examining certain aspects of a bacterium that

Accepted Answer

A)  can oxidize sulfur.
B)  is a purple non-sulfur bacteria which depends on light.
C)  obtains carbon from organic molecules.
D)  can use the energy from sunlight to build organic molecules from carbon dioxide.
E)  uses light as its energy source and carbon for organic compounds.F) B) and C)
G) A) and B)

Question 11

Sedimentary deposits known as ___________ were formed by mats of ancient prokaryotes known as cyanobacteria.

Accepted Answer

The answer of Sedimentary deposits known as ___________ were formed...

Question 12

Certain prokaryotes can withstand drying and hotter temperatures because of their ability to form

Accepted Answer

A)  cell walls.
B)  endospores.
C)  flagella.
D)  organelles.
E)  plasmids.F) All of the above
G) A) and C)

Question 13

Some species of prokaryotes play a vital role both in productivity and in nutrient _____________,providing substances essential to all other life forms.

Accepted Answer

The answer of Some species of prokaryotes play a vital...

Question 14

The prokaryotic DNA is located in the

Accepted Answer

A)  capsid region.
B)  nucleoid region.
C)  endospore region.
D)  peptidoglycan region.
E)  pili region.F) B) and E)
G) B) and D)

Question 15

Prokaryotes split into two lines early in the history of life.The differences are so fundamental that they are assigned to two different domains,the ________________ and the Bacteria.

Accepted Answer

The answer of Prokaryotes split into two lines early in...

Question 16

Which of the following events is least likely to result in a genetic change in a bacterium?

Accepted Answer

A)  pilus formation
B)  conjugation
C)  specialized transduction
D)  generalized transduction
E)  natural transformationF) B) and C)
G) A) and C)

Question 17

Cell walls of bacteria (domain Bacteria)usually consist of ______________,a network of polysaccharide molecules connected by polypeptide cross-links.

Accepted Answer

The answer of Cell walls of bacteria (domain Bacteria)usually consist...

Question 18

Gonorrhea and syphilis are most commonly controlled by

Accepted Answer

A)  abstinence.
B)  antibiotics.
C)  boiling water.
D)  fluoride treatment.
E)  pasteurization.F) A) and E)
G) C) and D)

Question 19

Choose letter of the best match from the following:
-Accessory DNA molecule.

Accepted Answer

A)  conjugation
B)  plasmid
C)  transduction (generalized) 
D)  transduction (specialized) 
E)  transformation (artificial) F) transformation (natural) G) C) and D)
H) B) and D)

Question 20

Early classification systems of the bacteria employed all of the following characteristics except

Accepted Answer

A)  the ability to photosynthesize.
B)  rRNA sequences.
C)  motility.
D)  colony or filament forming.
E)  sporulation or binary fission.F) C) and D)
G) C) and E)

Exam 28: Prokaryotes

Which of the following statements about tuberculosis (TB) is false?

Correct AnswerverifiedShow Answer

Sexually transmitted diseases include all of the following except

Correct AnswerverifiedShow Answer

Certain prokaryotes can withstand drying and hotter temperatures because of their ability to form

Correct AnswerverifiedShow Answer

Gonorrhea and syphilis are most commonly controlled by

Correct AnswerverifiedShow Answer

A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria.This means that she is studying a region within the bacterium that contains the

Correct AnswerverifiedShow Answer

When bacteria are exposed to nutrient-poor conditions,they form thick-walled structures that contain the chromosome and a small amount of cytoplasm.These structures are called

Correct AnswerverifiedShow Answer

In all of the following characteristics,prokaryotes differ from eukaryotes except in

Correct AnswerverifiedShow Answer

Tuberculosis remains a serious worldwide health problem due to all of the following except

Correct AnswerverifiedShow Answer

Early classification systems of the bacteria employed all of the following characteristics except

Correct AnswerverifiedShow Answer

If left untreated,syphilis infections go through four stages.The first stage is a sore called a chancre.The signs of the second stage are

Correct AnswerverifiedShow Answer

Choose letter of the best match from the following: -Accessory DNA molecule.

Correct AnswerverifiedShow Answer

Prokaryotes split into two lines early in the history of life.The differences are so fundamental that they are assigned to two different domains,the ________________ and the Bacteria.

Correct AnswerverifiedShow Answer

The prokaryotic DNA is located in the

Correct AnswerverifiedShow Answer

Cell walls of bacteria (domain Bacteria)usually consist of ______________,a network of polysaccharide molecules connected by polypeptide cross-links.

Correct AnswerverifiedShow Answer

Streptococcus mutans one of the bacteria that can cause the loss of tooth enamel in humans.The metabolic process that this particular species of bacteria uses that can result in enamel breakdown is

Correct AnswerverifiedShow Answer

Some species of prokaryotes play a vital role both in productivity and in nutrient _____________,providing substances essential to all other life forms.

Correct AnswerverifiedShow Answer

A microbiologist is conducting a research project on chemoautotrophs.This means that the investigator is examining certain aspects of a bacterium that

Correct AnswerverifiedShow Answer

Which of the following events is least likely to result in a genetic change in a bacterium?

Correct AnswerverifiedShow Answer

Sedimentary deposits known as ___________ were formed by mats of ancient prokaryotes known as cyanobacteria.

Correct AnswerverifiedShow Answer

Which of the following statements about bacterial conjugation is false?

Correct AnswerverifiedShow Answer

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