Chemical Factors Affecting Microbial Growth: Antibiotics

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Which microorganisms produce antibiotics?

Algae
Bacteria (correct)
Viruses
Protozoa

What is the primary function of antibiotics for the microorganism that produces them?

To aid in reproduction
To neutralize toxins
To increase growth rate
To survive difficult environmental conditions (correct)

At which stage of growth are antibiotics produced?

Stationary phase (correct)
Decline phase
Exponential phase
Log phase

What is the effect of bactericidal antibiotics on bacteria?

Reduces bacterial load by preventing cell wall formation (B) Signup and view all the answers

At what dose can an antibiotic be bacteriostatic?

Highest dose (D) Signup and view all the answers

What is the primary function of bacteriostatic antibiotics?

Inhibit growth and reproduction of bacteria by preventing the biosynthesis of cell proteins and nucleic acids (D) Signup and view all the answers

What is the difference between broad-spectrum and narrow-spectrum antibiotics?

Broad spectrum kills a wide range of microorganisms, while narrow spectrum kills Gram-positive bacteria only or Gram-negative bacteria not both (D) Signup and view all the answers

How do antibiotics that inhibit synthesis of bacterial cell walls cause bacterial cell death?

By causing a morphological imbalance and weakness in the rigidity of the cell wall, leading to cell explosion (A) Signup and view all the answers

What is the mechanism of antibiotic action for altering cell membrane permeability?

Antibiotic binds to the cell membrane, alters its structure and makes it more permeable, causing leakage of cellular molecules and cell death (B) Signup and view all the answers

Which condition is necessary for the effectiveness of an antibiotic according to the text?

Entry of the antibiotic and finding the target molecule in an active form (B) Signup and view all the answers

What is the primary function of antibiotics for the microorganism that produces them?

To aid in survival during difficult environmental conditions (A) Signup and view all the answers

At which stage of growth are antibiotics produced?

Stationary phase (B) Signup and view all the answers

What is the effect of bactericidal antibiotics on bacteria?

Cause bacterial death (C) Signup and view all the answers

What is the mechanism of antibiotic action for altering cell membrane permeability?

Interference with protein synthesis (D) Signup and view all the answers

What is the difference between broad-spectrum and narrow-spectrum antibiotics?

Broad-spectrum have a wide range of side effects, while narrow-spectrum have minimal side effects (D) Signup and view all the answers

What is the mechanism of action for antibiotics that inhibit synthesis of bacterial cell walls?

They bind enzymes that help form peptidoglycans, leading to weakness in the rigidity of the cell wall and eventually cell death. (A) Signup and view all the answers

What is the primary mechanism of antibiotic resistance related to?

Enzymatic destruction of drug (A) Signup and view all the answers

How does a bacteriostatic antibiotic work?

It inhibits growth and reproduction of bacteria by preventing biosynthesis of cell proteins and nucleic acids. (D) Signup and view all the answers

What does broad spectrum antibiotics do?

They kill a wide range of microorganisms. (B) Signup and view all the answers

What are the conditions necessary for the effectiveness of an antibiotic?

Finding the target molecule and remaining in contact with it in sufficient concentration. (B) Signup and view all the answers

Chemical Factors Affecting Microbial Growth: Antibiotics

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Questions and Answers

Which microorganisms produce antibiotics?

What is the primary function of antibiotics for the microorganism that produces them?

At which stage of growth are antibiotics produced?

What is the effect of bactericidal antibiotics on bacteria?

At what dose can an antibiotic be bacteriostatic?

What is the primary function of bacteriostatic antibiotics?

What is the difference between broad-spectrum and narrow-spectrum antibiotics?

How do antibiotics that inhibit synthesis of bacterial cell walls cause bacterial cell death?

What is the mechanism of antibiotic action for altering cell membrane permeability?

Which condition is necessary for the effectiveness of an antibiotic according to the text?

What is the primary function of antibiotics for the microorganism that produces them?

At which stage of growth are antibiotics produced?

What is the effect of bactericidal antibiotics on bacteria?

What is the mechanism of antibiotic action for altering cell membrane permeability?

What is the difference between broad-spectrum and narrow-spectrum antibiotics?

What is the mechanism of action for antibiotics that inhibit synthesis of bacterial cell walls?

What is the primary mechanism of antibiotic resistance related to?

How does a bacteriostatic antibiotic work?

What does broad spectrum antibiotics do?

What are the conditions necessary for the effectiveness of an antibiotic?

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