Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Question

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Answer 1

Question

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

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Students have asked these similar questions

When determining the clinical significance of cultures, a. the number of microbes is signifi cant. b. the presence of a single colony of a true pathogen may indicate the presence of the disease if the culture comes from a site known to be sterile (i.e., cerebrospinal fl uid). c. the repeated isolation of a relatively pure culture of any microorganism can mean it is an agent of disease, although this is not always the case. d. a range of tests may be needed to identify a pathogen. e. all of the above are true.

A microbiology student was given a mixed culture of two different gram positive bacteria species to grow into a culture medium using correct aseptic techniques. After two days,one gram positive bacterial species grew on the media and the growth appeared red on the surface of the medium. Tthe second gram positive bacterial species grew and the growth appeared yellow on the surface of the medium. What is the possible explanation for the differences in the color of the bacterial growth? A. the culture was contaminated B. the microbiologist put too much inoculum on the culture medium C. the medium was a selective medium D. the medium was differential

An elderly man with influenza acquires a case of pneumonia. Gram-positive cocci isolated from his sputum give beta-hemolysis on blood agar. The infection is very difficult to treat. Later, it is shown that the man shared the room with a patient with bone infection. Isolates from both infections were the same. a. Describe 2 biochemical tests that can be used for the definitive diagnosis. b. Describe 2 virulence factors of this pathogen and implicate them in diseases.

Answer 2

Question

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Question

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Question

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

Answer 6

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

Answer 7

Chapter 17, Problem 1MCQ

Summary Introduction

Introduction:

Bacteria are prokaryotic organisms. There are four basic shapes of bacteria; rod-shaped, spherical, comma-shaped, and spiral. Bacteria are cosmopolitan in nature. There are some bacteria, which are pathogenic in nature. These bacteria cause diseases in plants and animals. Tuberculosis, cholera, pneumonia, and gonorrhea are some of the diseases that are caused by pathogenic bacteria.

Answer 8

Expert Solution & Answer

Answer to Problem 1MCQ

Correct answer:

The most likely interpretation of isolation of two colonies of E. coli on a plate streaked from a urine sample is normal biota. Therefore, option (b) is correct.

Option (b) is given as “normal biota”.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Justify reasons for the correct statement:

Normal biota refers to the microbes that are present within the humans. They are present in the deep layers of skin or on the surface of the skin, in the oral mucosa, in the saliva, GI (gastrointestinal) tract, and in the conjunctiva. If two colonies of E. coli (Escherichia coli) are isolated from a streaked plate of urine sample, then it is because this microbe is a member of the normal biota of the body and can be present in the sample.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “probable infection”.

Presence of E. coli does not indicate a probable infection as this microbe is a part of normal biota of the body. Hence, it is a wrong answer.

Option (c) is given as “contamination”.

Presence of E. coli does not indicate contamination as this microbe is a part of the normal biota of the body. Hence, it is a wrong answer.

Hence, options (a) and (c) are incorrect.

Answer 12

Conclusion

E. coli is a member of the normal biota of the body and is not harmful. Its presence in a sample does not indicate contamination or probable infection.

Answer 13

Ch. 17.1 - Prob. 1AYP Ch. 17.1 - Prob. 2AYP Ch. 17.1 - Prob. 3AYP Ch. 17.1 - Prob. 4AYP Ch. 17.2 - Summarize the most common methods used for direct...Ch. 17.2 - Prob. 6AYP Ch. 17.2 - Prob. 7AYP Ch. 17.3 - Prob. 8AYP Ch. 17.3 - Differentiate between sensitivity and specificity.Ch. 17.3 - Explain how fluorescent antibodies can be used in...

Solution Summary: The author explains that Bacteria are prokaryotic organisms, and that pathogenic bacteria cause diseases in plants and animals.

Concept explainers

Answer to Problem 1MCQ

Explanation of Solution

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Chapter 17 Solutions