State True or False for These Microbiology Flashcards

Filter sterilization is used primarily to eliminate viruses from the filtrate (TRUE OR FALSE)

Bacteriostatic agents inhibit bacterial growth but do not specifically kill the organism against which they are directed (TRUE OR FALSE)

Cell wall synthesis can be inhibited by bacteriolytic agents (TRUE OR FALSE)

Antiseptics may either kill or inhibit the growth of microorganisms (TRUE OR FALSE)

The first widely used growth factors specifically designed to inhibit bacterial growth were the sulfa drugs (TRUE OR FALSE)

Because of their limited range of effectiveness, the fluoroquinolones are used primarily in treating infections caused by gram-positive bacteria (TRUE OR FALSE)

Isoniazid (INH) interferes with the synthesis of the mycobacterial-specific mycolic acid cell wall material (TRUE OR FALSE)

Growth factor analogs that resemble nucleic acids are widely used in the treatment of viral infections (TRUE OR FALSE)

Semisynthetic penicillins are generally more broad-spectrum than are non-semisynthetic penicillins (TRUE OR FALSE)

Cephalosporins contain a double B-lactam ring, whereas the penicillins contain a single B-lactam ring (TRUE OR FALSE)

Many Neisseria gonorrhoeae strains have developed B-lactamases that cleave the B-lactam rings (TRUE OR FALSE)

The tetracyclines are protein synthesis inhibitors (TRUE OR FALSE)

Most attempts at chemical control of viruses result in toxicity for the host (TRUE OR FALSE)

Which statements are true:
a. microbial parasites are often called pathogens
b. virulence is a quantitative measure of pathogenicity
c. the outcome of a host-parasite relationship varies considerably depending on the susceptibility of the host to the parasite

Which statement are true:
a. lysozyme cleaves nucleic acid bonds and disrupts the genetic make-up of the bacterial cell.
b. lactoperoxidase kills bacteria by generating singlet oxygen
c. salivary amylase inhibits protein digestion in the oral cavity
d. calcium phosphate crystals are a major, yet relatively unstudied, cause of dental plaque