A plaque assay uses the ________ technique
a. agar overlay
b. colony-plate
c. streak-plate
d. spot titering
Answer: A
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The critical period is
A) the time during which a sperm can fertilize an oocyte. B) the time during which an embryo can implant in the uterine lining. C) the time during development when structures are sensitive to damage from a mutation, toxin, or virus. D) the labor period.
What is the name of the process for removing amniotic fluid from a pregnant mother to obtain fetal cells for genetic testing?
A) amniocentesis B) polymerase chain reaction C) preimplantation genetic diagnosis D) in vitro fertilization
One of the main safety guidelines of DNA research is that ________
a. the host organisms are all female b. the host organisms are all male c. the host organisms can only survive under a narrow range of laboratory conditions d. there were no guidelines e. the host organisms can only be purchased from certain laboratories
Answer the following questions true (T) or false (F)
1. A microbe is either pathogenic or it is not. A microbe is either virulent or it is not. Both pathogenicity and virulence are all-or-nothing terms. 2. A microbe with a low ID50 does not necessarily cause severe disease. 3. A pathogen which uses a specific portal of entry will only be able to establish an infection in the system associated with that portal.