Question 1

Plasmids are distinguished from bacterial chromosomes in that

Accepted Answer

A)  plasmids are circular,bacterial chromosomes are linear.
B)  plasmids occur in the cytoplasm,bacterial chromosomes occur in the nucleus.
C)  plasmids are composed of RNA,bacterial chromosomes are composed of DNA.
D)  plasmids have few genes,bacterial chromosomes have many genes.
E)  plasmids consist of single-stranded nucleic acids,bacterial chromosomes consist of double-stranded nucleic acids.F) A) and C)
G) B) and D)

Question 2

Prokaryotes that harvest both energy and carbon atoms from organic molecules are called

Accepted Answer

A)  photoautotrophs.
B)  chemolithoautotrophs.
C)  photoheterotrophs.
D)  chemoheterotrophs.
E)  nitrogen fixers.F) B) and C)
G) B) and E)

Question 3

DNA replication and gene expression in archaeans more closely resemble eukaryotic cells than the same processes in bacteria.However both Bacteria and Archaea are prokaryotic.What does this suggest?

Accepted Answer

A)  Eukaryotic cells are descended from modern Archaeans.
B)  Bacterial cells are not related to Archaeans.
C)  Eukaryotic cells shared a more recent common ancestor with Archaeans than with bacterial cells.
D)  There must have been 2 origin events,one producing the bacteria and the other producing Archaeans and eukaryotic cells.E) C) and D)
F) B) and C)

Question 4

Various techniques have been developed to isolate strains of bacteria carrying a particular mutation.One of them is,bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells.In this environment,

Accepted Answer

A)  both wild-type and mutant cells are killed.
B)  both wild-type and mutant cells survive.
C)  wild-type cells survive; mutant cells die.
D)  wild-type cells die; mutant cells survive.
E)  only double mutants survive.F) A) and B)
G) None of the above

Question 5

Check all of the mutually beneficial relationships between prokaryotes and eukaryotes.

Accepted Answer

A)  Prokaryotes aid in digestion in ruminants.
B)  The human microbiome aids in human health.
C)  Nitrogen-fixing bacteria live in plant root nodules.
D)  Agrobacterium tumefaciens bacteria that form galls in some plants.E) A) and B)
F) None of the above

Question 6

In some bacteria,a capsule surrounds the cell wall.It is made up of

Accepted Answer

A)  a lipopolysaccharide.
B)  peptidoglycan.
C)  gelatin.
D)  pili.
E)  glycoprotein.F) A) and C)
G) B) and E)

Question 7

A high concentration of chlorophyll imbedded in the plasma membrane fold of a newly discovered species of bacteria suggests a:

Accepted Answer

A)  Chemolithoautotrophic metabolism
B)  Chemoheterotrophic metabolism
C)  Photoautotrophic metabolism
D)  Photoheterotrophic metabolismE) None of the above
F) C) and D)

Question 8

Gonorrhea and syphilis are most commonly controlled by

Accepted Answer

A)  abstinence.
B)  antibiotics.
C)  boiling water.
D)  fluoride treatment.
E)  pasteurization.F) B) and D)
G) None of the above

Question 9

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 10

Dental plaque (a biofilm) ,a first stage in tooth decay,consists of

Accepted Answer

A)  sugars.
B)  bacteria surrounded by a polysaccharide matrix.
C)  fluoride.
D)  lactic acid.
E)  bacteria and high pH.F) B) and E)
G) A) and C)

Question 11

Which of the following statements about generalized transduction is false?

Accepted Answer

A)  "Head full" packaging always places only phage DNA into the phage head during phage packaging in generalized transduction.
B)  Generalized transduction always involves lytic phage.
C)  Generalized transduction can be used to map bacterial genes.
D)  Genes that are close together on the bacterial chromosome will have a relatively large cotransduction frequency.
E)  Two recombination events are necessary to integrate the transferred DNA during generalized transduction.F) A) and D)
G) A) and C)

Question 12

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) None of the above
F) B) and C)

Question 13

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) A) and B)
G) A) and E)

Question 14

Prokaryotes are very important ecologically because of their involvement in all of the following except

Accepted Answer

A)  photosynthesis.
B)  nitrogen fixation.
C)  STDs.
D)  denitrification.
E)  bioremediation.F) D) and E)
G) B) and E)

Question 15

Bacterial sexually transmitted diseases include all of the following except

Accepted Answer

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

Question 16

Irregular dental hygiene and a high sugar diet may led to tooth decay.Why?

Accepted Answer

A)  Bacteria consume calcium.
B)  Lactic acid fermentation is used to generate ATP under anaerobic conditions.
C)  Plaque degrades the tooth's protective mucosal layers.
D)  Glucose forms a weak acid when dissolved in saliva.
E)  High concentrations of sugar soften the tooth enamel.F) A) and E)
G) C) and D)

Question 17

Are transformation and transduction the same process?

Accepted Answer

A)  Yes; they both involve the acquisition of viral genes.
B)  No; only transformation passes on genes for pathogenicity.
C)  Yes; both processes transfer specific gene products to a specific bacterium.
D)  No; although both involve gene transfer the sources of the genetic material differ.E) None of the above
F) C) and D)

Question 18

Phil has chronic ulcers,he has been taking acid blockers and drinking vast amounts of liquid antacids.These help relieve the symptoms but he still suffers from ulcers.What would be the best course of action to treat the source of his ulcers?

Accepted Answer

A)  Taking several different antacids
B)  Increasing the dosage of acid blockers
C)  Taking a course of antibiotics
D)  Reducing the stress in his daily life
E)  Changing his diet to include more fiberF) B) and C)
G) A) and D)

Question 19

Many cells of the immune system have receptors that detect peptidoglycans and lipopolysaccharides.How do pathogenic bacteria avoid detection?

Accepted Answer

A)  Pathogenic bacteria lack cell walls.
B)  Pathogens often encase themselves in a gelatinous capsule.
C)  Peptidoglycans are absent from pathogenic bacteria.
D)  Disease is only possible if the immune system has been compromised by some other event.E) A) and B)
F) B) and C)

Question 20

A researcher observed a reduction in the number of chromosomes during cell division for a microbe,he concludes that the microbe must be

Accepted Answer

A)  Eukaryotic
B)  Prokaryotic
C)  An archaean
D)  a virusE) A) and C)
F) A) and B)

Exam 27: Prokaryotes

Irregular dental hygiene and a high sugar diet may led to tooth decay.Why?

Correct Answer
verified

DNA replication and gene expression in archaeans more closely resemble eukaryotic cells than the same processes in bacteria.However both Bacteria and Archaea are prokaryotic.What does this suggest?

Correct Answer
verified

Check all of the mutually beneficial relationships between prokaryotes and eukaryotes.

Correct Answer
verified

Which of the following statements about generalized transduction is false?

Correct Answer
verified

Correct Answer
verified

In some bacteria,a capsule surrounds the cell wall.It is made up of

Correct Answer
verified

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

Correct Answer
verified

Prokaryotes that harvest both energy and carbon atoms from organic molecules are called

Correct Answer
verified

Dental plaque (a biofilm) ,a first stage in tooth decay,consists of

Correct Answer
verified

A researcher observed a reduction in the number of chromosomes during cell division for a microbe,he concludes that the microbe must be

Correct Answer
verified

Many cells of the immune system have receptors that detect peptidoglycans and lipopolysaccharides.How do pathogenic bacteria avoid detection?

Correct Answer
verified

Gonorrhea and syphilis are most commonly controlled by

Correct Answer
verified

Prokaryotes are very important ecologically because of their involvement in all of the following except

Correct Answer
verified

Bacterial sexually transmitted diseases include all of the following except

Correct Answer
verified

Phil has chronic ulcers,he has been taking acid blockers and drinking vast amounts of liquid antacids.These help relieve the symptoms but he still suffers from ulcers.What would be the best course of action to treat the source of his ulcers?

Correct Answer
verified

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

Correct Answer
verified

Plasmids are distinguished from bacterial chromosomes in that

Correct Answer
verified

Are transformation and transduction the same process?

Correct Answer
verified

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 Answer
verified

A high concentration of chlorophyll imbedded in the plasma membrane fold of a newly discovered species of bacteria suggests a:

Correct Answer
verified

Exam 27: Prokaryotes

Irregular dental hygiene and a high sugar diet may led to tooth decay.Why?

Correct AnswerverifiedShow Answer

DNA replication and gene expression in archaeans more closely resemble eukaryotic cells than the same processes in bacteria.However both Bacteria and Archaea are prokaryotic.What does this suggest?

Correct AnswerverifiedShow Answer

Check all of the mutually beneficial relationships between prokaryotes and eukaryotes.

Correct AnswerverifiedShow Answer

Which of the following statements about generalized transduction is false?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In some bacteria,a capsule surrounds the cell wall.It is made up of

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

Prokaryotes that harvest both energy and carbon atoms from organic molecules are called

Correct AnswerverifiedShow Answer

Dental plaque (a biofilm) ,a first stage in tooth decay,consists of

Correct AnswerverifiedShow Answer

A researcher observed a reduction in the number of chromosomes during cell division for a microbe,he concludes that the microbe must be

Correct AnswerverifiedShow Answer

Many cells of the immune system have receptors that detect peptidoglycans and lipopolysaccharides.How do pathogenic bacteria avoid detection?

Correct AnswerverifiedShow Answer

Gonorrhea and syphilis are most commonly controlled by

Correct AnswerverifiedShow Answer

Prokaryotes are very important ecologically because of their involvement in all of the following except

Correct AnswerverifiedShow Answer

Bacterial sexually transmitted diseases include all of the following except

Correct AnswerverifiedShow Answer

Phil has chronic ulcers,he has been taking acid blockers and drinking vast amounts of liquid antacids.These help relieve the symptoms but he still suffers from ulcers.What would be the best course of action to treat the source of his ulcers?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Plasmids are distinguished from bacterial chromosomes in that

Correct AnswerverifiedShow Answer

Are transformation and transduction the same process?

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

A high concentration of chlorophyll imbedded in the plasma membrane fold of a newly discovered species of bacteria suggests a:

Correct AnswerverifiedShow Answer

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