Question

1. An antimicrobial drug that inhibits peptidoglycan synthesis is most likely to be effective against ___

1. Gram-positive bacteria
2. Protozoan parasites
3. Fungi
4. Viruses
5. Gram-negative bacteria

2. Which of the diseases listed below is not caused by herpesvirus?

1. Shingles
2. Conjunctivitis
3. Chicken pox
4. Small pox
5. None of the above (all are caused by herpesvirus )

3. Subunit vaccines tend to be safer than whole-cell vaccines because ____.

1. They are antigenic
2. They produce a stronger immune response
3. They contain avirulent strains
4. They cannot reproduce in the host
5. They contain intact but dead microbes

4. Which of the following is sensitive to penicillin?

1. Pseudomonas
2. Herpesvirus
3. Candida
4. Chlamydia
5. Streptococcus

Answer 1

a. Gram-positive bacteria

An antimicrobial drug that inhibits peptidoglycan synthesis is most likely to be effective against Gram-positive bacteria.

These antibiotics are known as beta-lactam antibiotics which acts by inhibiting the peptidoglycan synthesis in the cell wall of the bacteria. Example: Penicillin.

e. None of the above

Shingles, conjunctivitis, chickenpox, smallpox all are caused by Varicella-Zoster which is a part of a group of Herpes Virus.

d. They cannot reproduce in the host

Subunit vaccine contains a fragment of the pathogen and when introduced in the host elicits an immune response. But, important point to note is that they cannot reproduce in the host cell and that's the reason it is safer than the whole-cell vaccines.

e. Streptococcus

Penicillin is an antibiotic that is widely used to treat infections related to beta-hemolytic Streptococci.