Microbiology Exam 3 Study Quizes 1-6

41問 • 10ヶ月前

問題一覧

No= 300 cells Generation (doubling) time = 40 minutes Growth period: 3 hrs and 20 min N=numbers of doublings = the minute of growth (1) _____ divided by the 40 min generation time This = 2) ____, the number of doublings (n) is 3 hours and 20 minutes The final number of cells in this population after growth is (3) ______ 1) How long is the growth of period in minutes?

200

No = 300 cells Generation (doubling) time; 40 min Growth period; 3hrs and 20 min N(number of doublings) = the minutes of growth 1) ____ divided by 40 minute generation time. This = 2) ______, the number of doubling (n) in 3 hrs and 20 mins. The final number of cells in this population after growth is (3) ___ 3) What is the final size of the population at the end of the growth period?

9600

10 cells with a generation time of 15 minutes are allowed to grow for 3hrs n=

10 cells with a generation time of 15 min are allowed to grow for 3 hrs What is the size of the population at the end of the growth period?

40,960

What difference in the final population size would it make if one cell died early in the growth period compared to one cell dying late in the growth period?

One cell dying early would result in a smaller final population than a cell dying later in the growth period

In 2017 the FDA ruled what about the use of triclosan in soaps and other antiseptic wash products?

Tricosan could no longer be used in these products

The specific FDA ruling was made because

There was no data/evidence that the activity of triclosan in the products had any benefits to health

Why was triclosan allowed to remain in Colgate Total Tooth Paste?

The ingredient was shown by scientific data to provide protection against gingivitis, a common gum disease

What is the downside of using triclosan in Personal Care products? (Select all that apply)

Triclosan might increase the resistance of bacteria to other antibacterial treatments or controls , Triclosan in the environment could be harmful to aquatic animals , Triclosan can affect the activity of the body’s hormone and cause adverse effects , people with higher concentration of triclosan in their urine have been shown to have a higher incidence of allergies

Which is the status of cleaning and disinfecting offices and other workplace in response to the COVID pandemic esp at the start?

Much more frequent and thorough than before

Why was the new level of cleaning worrisome to some health scientist?

Chemicals being used for sanitization and disinfection were much stronger and potentially toxic

The chemicals being used are on the EPA’s approved “N list” and are effective against coronavirus. Why are some scientist concerned about this?

The chemicals haven’t been tested for human safety

Limited studies in rats have shown that these products…(choose all that apply)

can potentially cause birth defects in rodents , may increase the rate of severity of asthma , may cause neurological problems in rodents

The use if electrostatic sprayers are a concern because

the risk of aerosolizing, misting, or fogging the disinfectants on humans hasn’t been studied

What non-chemical disinfecting treatment is being used to disinfect surfaces?

intense UV light

According to the CDC report in recent years the demand for unpasteurized milk in the US has

increased

What was the most common bacterial species associated with the illness caused by raw milk consumption

campylobacter spp

Raw milk is healthier and more nutritious than pasteurized milk

false

If animals raised in sanitary conditions on human farms, their milk is safe especially if it’s certified as organic

false

According to the data in Figure 2, the leading cause of illness in the 1-4 years age group due to raw milk was

campylobacter

From module 3 notes Which set of heat treatments best describe the pasteurization techniques known as Ultra high Pasteruization

140C for less than 1 second

What type of cell does the coronavirus first infect after getting into the body?

nasal epithelial cell

As the infection proceeds, newly released virions travel to the ____ and infect the _____

Lungs, alveoli

What is the specific receptor site on the host cell that the virus needs to attach and infect?

angiotensin-converting enzyme 2 (ACE-2)

What immune cell initially respond to the presence of viruses

macrophages and neutrophils

As a consequence of this response to the virus, what occurs at the site of the infected tissue

Alveoli filled with fluid

An individual virus particles is called a

virion

What region of the respiratory system does the coronavirus replicate in?

cells in the entire system-nose, throat, bronchii, lung cells

What is the order of the virus replication step as it encounters its host cell?

Attachement, entry, biosynthesis, assembly, release

This measles outbreak started with this number of initial cases; ___, from exposure at this location

1 case, Disney Theme park in California

How many of the patients in this outbreak had NOT been vaccinated for measles

What was the total number of cases in this measles outbreak at the time this CDC report was written (feb 15,2015)

125

How does the CDC know that most of the early measles were caused by the same strain of measles viruses?

virus sample from 30 of th patients all had the same B3 genotype

Of the 28 intentionally unvaccinated patients, the reason given for not getting vaccinated was

for personal reasons they objected to being vaccinated

What best describes bacteriophages

viruses whose host cell are bacteria

The mayo clinci trial phage therapy was used to treat what type of infection?

infection on knee joint replacement device

Phage therapy was necessary for the patient because

the pathogenic bacteria was formed an antibiotic resistant biofilm on the prosthetic device

The type of phage chosen from the Phage bank to treat an infection has to be specifically matched to the species of the pathogenic bacteria causing the problem

true

How are phage therapies administrated to the patient?

as purified injectible suspension

According to the data in Figure 2, the leading cause of illness in the 1-4 years age group due to raw milk was

campylobacter

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問題一覧

200

9600

10 cells with a generation time of 15 minutes are allowed to grow for 3hrs n=

10 cells with a generation time of 15 min are allowed to grow for 3 hrs What is the size of the population at the end of the growth period?

40,960

What difference in the final population size would it make if one cell died early in the growth period compared to one cell dying late in the growth period?

One cell dying early would result in a smaller final population than a cell dying later in the growth period

In 2017 the FDA ruled what about the use of triclosan in soaps and other antiseptic wash products?

Tricosan could no longer be used in these products

The specific FDA ruling was made because

There was no data/evidence that the activity of triclosan in the products had any benefits to health

Why was triclosan allowed to remain in Colgate Total Tooth Paste?

The ingredient was shown by scientific data to provide protection against gingivitis, a common gum disease

What is the downside of using triclosan in Personal Care products? (Select all that apply)

Which is the status of cleaning and disinfecting offices and other workplace in response to the COVID pandemic esp at the start?

Much more frequent and thorough than before

Why was the new level of cleaning worrisome to some health scientist?

Chemicals being used for sanitization and disinfection were much stronger and potentially toxic

The chemicals being used are on the EPA’s approved “N list” and are effective against coronavirus. Why are some scientist concerned about this?

The chemicals haven’t been tested for human safety

Limited studies in rats have shown that these products…(choose all that apply)

can potentially cause birth defects in rodents , may increase the rate of severity of asthma , may cause neurological problems in rodents

The use if electrostatic sprayers are a concern because

the risk of aerosolizing, misting, or fogging the disinfectants on humans hasn’t been studied

What non-chemical disinfecting treatment is being used to disinfect surfaces?

intense UV light

According to the CDC report in recent years the demand for unpasteurized milk in the US has

increased

What was the most common bacterial species associated with the illness caused by raw milk consumption

campylobacter spp

Raw milk is healthier and more nutritious than pasteurized milk

false

If animals raised in sanitary conditions on human farms, their milk is safe especially if it’s certified as organic

false

According to the data in Figure 2, the leading cause of illness in the 1-4 years age group due to raw milk was

campylobacter

From module 3 notes Which set of heat treatments best describe the pasteurization techniques known as Ultra high Pasteruization

140C for less than 1 second

What type of cell does the coronavirus first infect after getting into the body?

nasal epithelial cell

As the infection proceeds, newly released virions travel to the ____ and infect the _____

Lungs, alveoli

What is the specific receptor site on the host cell that the virus needs to attach and infect?

angiotensin-converting enzyme 2 (ACE-2)

What immune cell initially respond to the presence of viruses

macrophages and neutrophils

As a consequence of this response to the virus, what occurs at the site of the infected tissue

Alveoli filled with fluid

An individual virus particles is called a

virion

What region of the respiratory system does the coronavirus replicate in?

cells in the entire system-nose, throat, bronchii, lung cells

What is the order of the virus replication step as it encounters its host cell?

Attachement, entry, biosynthesis, assembly, release

This measles outbreak started with this number of initial cases; ___, from exposure at this location

1 case, Disney Theme park in California

How many of the patients in this outbreak had NOT been vaccinated for measles

What was the total number of cases in this measles outbreak at the time this CDC report was written (feb 15,2015)

125

How does the CDC know that most of the early measles were caused by the same strain of measles viruses?

virus sample from 30 of th patients all had the same B3 genotype

Of the 28 intentionally unvaccinated patients, the reason given for not getting vaccinated was

for personal reasons they objected to being vaccinated

What best describes bacteriophages

viruses whose host cell are bacteria

The mayo clinci trial phage therapy was used to treat what type of infection?

infection on knee joint replacement device

Phage therapy was necessary for the patient because

the pathogenic bacteria was formed an antibiotic resistant biofilm on the prosthetic device

The type of phage chosen from the Phage bank to treat an infection has to be specifically matched to the species of the pathogenic bacteria causing the problem

true

How are phage therapies administrated to the patient?

as purified injectible suspension

According to the data in Figure 2, the leading cause of illness in the 1-4 years age group due to raw milk was

campylobacter