Relapsing fever involves
A) Initial symptoms of fever, headache, fatigue.
B) Campers and forestry personnel.
C) Soft-bodied ticks transmitting Borrelia hermsii.
D) Human body louse transmitting Borrelia recurrentis.
E) All of these choices are correct
E) All of these choices are correct
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Iatrogenic CJD has been transmitted by all of the following EXCEPT
A. grafts of dura mater. B. human growth hormone. C. corneal grafts. D. liver transplants.
Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells. b. Viruses can only find the necessary components to keep itself alive in one type of cell. c. Viruses can only infect cells that have the appropriate receptors for them to attach to. d. Viruses cannot move throughout the body so only infect the cells they first come into contact with.
Cnidarians have an outer layer derived from ectoderm, an inner layer from endoderm, and a ____
a. middle layer of mesoderm b. watery middle layer c. well-developed brain d. jellylike matrix in between e. complete gut
Advancements in many fields of biology, agriculture, conservation, and medicine benefit from DNA technology because
A. researchers have gained understanding of how the DNA structure relates to many traits and diseases. B. the genes among sometimes diverse organisms can produce favorable traits when transferred from one to another. C. even DNA replication and cell divisions can produce point mutations and gene abnormalities affecting traits of interest. D. All of the answer choices are correct. E. each organism, especially among the eukaryotes, inherits a mix of variable genetic information from previous generations.