Bacterial Cell Walls

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What are the sugar residues typically composed of?

Simple sugar (correct)
Fatty acids
Amino acids
Complex carbohydrates

Which organelle do bacteria secrete sugar moieties from?

Plasma membrane (correct)
Cell wall
Cytoplasm
Nucleus

What is the primary function of sugar moieties in bacteria?

Cell signaling
Energy production
Coating the outer wall (correct)
DNA replication

What is the location where sugar moieties are distributed after secretion?

Outer wall (B) Signup and view all the answers

Which of the following is NOT a function of sugar moieties in bacteria?

Protein synthesis (C) Signup and view all the answers

What is the primary purpose of a selective medium?

To differentiate between microorganisms by suppressing some while allowing others to grow (B) Signup and view all the answers

Which of the following is a characteristic of a selective medium?

It differentially affects the growth of microorganisms (A) Signup and view all the answers

What is the result of using a selective medium?

Some microorganisms in the sample will grow, while others will not (B) Signup and view all the answers

Why is a selective medium used in microbiology?

To isolate and characterize a specific microorganism (A) Signup and view all the answers

What is the principle behind a selective medium?

Differential growth suppression (C) Signup and view all the answers

What type of medium is Thayer Martin Agar?

Selective medium (C) Signup and view all the answers

Which of the following antibiotics is NOT present in Thayer Martin Agar?

Penicillin (D) Signup and view all the answers

What is the purpose of adding antibiotics to Thayer Martin Agar?

To inhibit the growth of unwanted microorganisms (B) Signup and view all the answers

What microorganism is Thayer Martin Agar used to recover?

Neisseria gonorrhoeae (A) Signup and view all the answers

What is the main advantage of using Thayer Martin Agar?

It allows for the isolation of Neisseria gonorrhoeae from mixed cultures (D) Signup and view all the answers

What is the purpose of bile salt in MacConkey's Agar?

To inhibit the growth of most Gram-positive bacteria (A) Signup and view all the answers

What type of bacteria does MacConkey's Agar inhibit?

Most Gram-positive bacteria (A) Signup and view all the answers

What is the primary function of MacConkey's Agar?

To promote the growth of Enterobacteriaceae members (D) Signup and view all the answers

What is the effect of bile salt on Gram-positive bacteria in MacConkey's Agar?

It inhibits their growth (D) Signup and view all the answers

Why is MacConkey's Agar used for Enterobacteriaceae members?

Because it selects for Enterobacteriaceae members, which are Gram-negative bacteria (B) Signup and view all the answers

How does the recipient cell obtain donor DNA?

By direct uptake of donor DNA (D) Signup and view all the answers

What is the role of the plasmid in conjugation?

To enable the transfer of genetic material (D) Signup and view all the answers

Bacterial Cell Walls

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