In the practice of variolation, how were patients exposed to the smallpox pathogen?
A) Babies were nursed by women who had already had smallpox.
B) They were exposed to bedding or clothes of a person with smallpox.
C) They were exposed to a bovine version of the disease, which is mild in humans.
D) They were exposed to dried scabs from smallpox lesions.
E) They were placed in a room with a person who currently had smallpox.
Answer: D
You might also like to view...
Where do antigen-presenting cells interact with T cells?
a. the thymus gland
b. the pituitary gland c. the lymph nodes d. the adrenal glands e. the bone marrow
One way to genetically engineer S. cerevisiae is by homologous recombination. If a given sequence is thus introduced and is integrated via two regions of homology, is it more probably introduced as a linear or as a circular entity?
What will be an ideal response?
An Hfr cell and an F? cell result from conjugation between a donor cell and a recipient cell. Which statement is false regarding this event?
A. The donor could not have been F?. B. The donor could have been either F? or F+. C. The recipient could have been F?. D. The donor could have been Hfr.
Once a hormone activates the enzyme adenylyl cyclase, ATP is converted to cAMP, which in turn:a
activates protein kinase. b. inhibits phosphodiesterase. c. initiates more cAMP production. d. initiates protein synthesis. e. inhibits protein synthesis.