A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?
A. Viruses can infect bacteria, transferring pathogenic genes. The viral genes can then be suppressed, causing the bacteria to not replicate viruses.
B. The attachment structures on the virus and the receptors on the host cells make for exquisite specificity of viruses for particular bacterial species.
C. Antibiotic resistance in humans is on the increase, so using a different kind of therapy is more beneficial.
D. A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death.
Answer: B
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Which of the following is NOT a way that bacteria benefit humans?
A. produce foodstuffs such as cheese B. produce antibiotics C. break down substances harmful to humans, such as wastes, toxins, explosives, and petrochemicals D. kill harmful insects E. transfer nutrients across intestinal membranes
The diarrhea that is a symptom of diseases like cholera is due to problems in the function of the
A. stomach. B. small intestine. C. appendix. D. large intestine. E. gall bladder.
How do new viruses arise?
a) mutation of existing viruses b) not taking all your antibiotics c) spread to new host species d) all of the above e) only a and c
A carnivorous plant, such as a sundew, may be considered both a ________ when it eats a carnivorous spider
A) primary consumer and a secondary consumer B) producer and a secondary consumer C) primary consumer and a tertiary consumer D) producer and a primary consumer E) producer and a tertiary consumer