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Questions and Answers
What is the main function of the central mesosome in Gram-positive bacteria?
What is the main function of the central mesosome in Gram-positive bacteria?
- Transport of extracellular enzymes outside the cell wall
- Site of protein synthesis.
- Protect the cell membrane from injuries (correct)
- Taking part in cell division and DNA replication
The outer membrane of Gram-negative cells is more permeable than the plasma membrane because
The outer membrane of Gram-negative cells is more permeable than the plasma membrane because
- Porin proteins establish holes in the outer membrane.
- LPS is larger than most membrane phospholipids. (correct)
- The core polysaccharide spans the lipid bilayer.
- Lipoproteins stretch the outer membrane.
Which of the following statements about bacterial flagella is true?
Which of the following statements about bacterial flagella is true?
- The filaments are composed of protein subunits called flagellin.
- All motile bacteria have flagella. (correct)
- Flagella increase in length by adding new material to the tip not the base.
- The flagella move cells by acting as propellers.
Which one of the following forms of immunity to viruses would be least likely to be life long?
Which one of the following forms of immunity to viruses would be least likely to be life long?
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Penicillin and lysozyme are similar in that
Penicillin and lysozyme are similar in that
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What mechanism allows HIV to evade the immune system?
What mechanism allows HIV to evade the immune system?
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Study Notes
Bacterial Cell Structure and Function
- The main function of the central mesosome in Gram-positive bacteria is to protect the cell membrane from injuries.
- In Gram-negative cells, the outer membrane is more permeable than the plasma membrane because LPS is larger than most membrane phospholipids.
Bacterial Flagella
- Not all motile bacteria have flagella, but those that do can direct their movement toward a source of nutrients.
- Flagella increase in length by adding new material to the tip, not the base.
- The filaments of flagella are composed of protein subunits called flagellin.
Immunity to Viruses
- Passive immunity is a form of immunity to viruses that would be least likely to be lifelong.
- Active immunity, on the other hand, is a form of immunity that can be lifelong.
Antimicrobial Agents
- Penicillin and lysozyme are similar in that they both affect cell walls.
Viral Pathogens
- HIV has the ability to evade the immune system.
- Herpes viruses have distinct properties that characterize them.
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