Which of the following viruses are the only ssDNA viruses that cause disease in humans?
A) Parvoviridae
B) Hepadnaviridae
C) Poxviridae
D) Polyomaviridae
E) Herpesviridae
A
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Which of the following choices best describes the genetic engineering used to prevent rejection of xenotransplants?
1.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig. 2.Hyperacute rejection of MHC proteins from animal donors is prevented by the use of cloned animal tissues lacking MHC markers. 3.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig, resulting in chimeric immune systems. 4.A bone marrow transplant from the human patient to the donor pig affects MHC proteins on the pig organs, reducing the severity of xenotransplant rejection.
Hemoglobin is composed of four _______.
A. protein chains B. heme groups C. iron atoms D. two of the above E. all of the above
The buildup of soil on bare rock by the decomposition of early colonizers is characteristic of ________ succession
A) primary B) ecological C) opportunistic D) secondary
The function of corticotropin-releasing factor (CRF) is to stimulate:a
the release of adrenocorticotropic hormone. b. gluconeogenesis. c. adrenaline release. d. glycogen synthesis. e. the inflammatory response.