The eradication of smallpox was possible because
A) it was a relatively mild disease.
B) insect vectors were eliminated.
C) there are no animal reservoirs of the virus.
D) it can be prevented with the same vaccine used to prevent chickenpox.
E) it occurs only in the tropics.
C
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The organ system that is responsible for the physical and chemical breakdown of food and for the absorption, processing, and release of digestive products.
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
DNA molecules that contain pieces of DNA from two different sources are defined as
A. biotechnology. B. gene cloning. C. recombinant DNA. D. genetic engineering.
A carbon to nitrogen (C/N) ratio of 20 or less in soil results in the loss of soluble nitrogen from the system.
Answer the following statement true (T) or false (F)
Sequencing of the HIV-1 genome revealed that it is most closely related to ____.
A. simian immunodeficiency virus B. feline immunodeficiency virus C. bovine immunodeficiency virus D. hepatitis B E. H1N1