25 Questions
What are the sugar residues typically composed of?
Simple sugar
Which organelle do bacteria secrete sugar moieties from?
Plasma membrane
What is the primary function of sugar moieties in bacteria?
Coating the outer wall
What is the location where sugar moieties are distributed after secretion?
Outer wall
Which of the following is NOT a function of sugar moieties in bacteria?
Protein synthesis
What is the primary purpose of a selective medium?
To differentiate between microorganisms by suppressing some while allowing others to grow
Which of the following is a characteristic of a selective medium?
It differentially affects the growth of microorganisms
What is the result of using a selective medium?
Some microorganisms in the sample will grow, while others will not
Why is a selective medium used in microbiology?
To isolate and characterize a specific microorganism
What is the principle behind a selective medium?
Differential growth suppression
What type of medium is Thayer Martin Agar?
Selective medium
Which of the following antibiotics is NOT present in Thayer Martin Agar?
Penicillin
What is the purpose of adding antibiotics to Thayer Martin Agar?
To inhibit the growth of unwanted microorganisms
What microorganism is Thayer Martin Agar used to recover?
Neisseria gonorrhoeae
What is the main advantage of using Thayer Martin Agar?
It allows for the isolation of Neisseria gonorrhoeae from mixed cultures
What is the purpose of bile salt in MacConkey's Agar?
To inhibit the growth of most Gram-positive bacteria
What type of bacteria does MacConkey's Agar inhibit?
Most Gram-positive bacteria
What is the primary function of MacConkey's Agar?
To promote the growth of Enterobacteriaceae members
What is the effect of bile salt on Gram-positive bacteria in MacConkey's Agar?
It inhibits their growth
Why is MacConkey's Agar used for Enterobacteriaceae members?
Because it selects for Enterobacteriaceae members, which are Gram-negative bacteria
How does the recipient cell obtain donor DNA?
By direct uptake of donor DNA
What is the role of the plasmid in conjugation?
To enable the transfer of genetic material
What is a necessary condition for transformation to occur?
The competence of the recipient cell
How many live bacteria are involved in conjugation?
Two
What is the result of the transfer of genetic material from a plasmid?
Recombinant DNA
Learn about the composition of bacterial cell walls, including the role of simple sugar residues and their secretion by bacteria. Discover how these sugar moieties coat the outer wall of bacteria.
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