Antibiotic resistances are often acquired by
a. horizontal gene transfer.
b. spontaneous mutations.
c. movement of mobile genetic elements.
d. all of the above.
Answer: D
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Creutzfeldt-Jacob disease is
A. caused by a viroid. B. also called "mad cow disease." C. caused by a chronic latent virus. D. initiated by an oncogenic virus. E. a spongiform encephalopathy of humans.
Our most potent weapon in the fight against viruses is
A. antibiotics. B. sulfa drugs. C. gene therapy. D. surgery. E. vaccinations.
If Escherichia coli is cultured in broth containing both glucose and lactose, it ________.
A. uses only the glucose (it cannot use lactose as a source of carbon) B. uses lactose preferentially until the supply is exhausted, then uses glucose C. uses glucose preferentially until the supply is exhausted, then uses lactose D. uses glucose and lactose simultaneously
Which of the following biological technology has enabled scientists to extend the life span of individuals who are suffering from HIV / AIDS?
What will be an ideal response?