Which of the following environmental factors makes microbial populations resistant to antimicrobial agents?
A) Ability to form a biofilm
B) Acidic conditions
C) Presence of organic matter
D) All of the above
Ans: D) All of the above
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The decrease or loss of virulence of a pathogen is referred to as
A) aging. B) attenuation. C) disinfectivity. D) lethal dose.
The enzyme DNA polymerase is most active during which of the following phases of the mitotic cell cycle?
a) Gap-2 (G2) b) Metaphase c) Cytokinesis d) Prophase e) Gap-1 (G1) f) Anaphase g) Telophase h) Synthesis (S phase)
All members of the golden hamster species known today are descendants of a single litter collected in Syria in 1939. Its diploid chromosome number is 44. Two other species of hamster, each with a diploid number of 22, overlap geographically in Syria
The golden hamster is thought to be a new species from the mating of a male and female of the two other hamster species. What mechanism might explain this recent event of speciation? A) Polyploidy B) Adaptive radiation C) Formation of a fertile hybrid and halving of the chromosome number of this hybrid D) Disruptive selection E) Temporal isolation
The ability of the body to react to foreign substances is known as: