Bacteria contain plasmids because
A. they are essential for growth.
B. they provide genes that allow the bacteria to grow and thrive in the presence of potential toxins.
C. they are essential for cellular respiration.
D. humans artificially created plasmids and then inserted them into bacteria.
E. they are essential for chromosome replication and binary fission.
B. they provide genes that allow the bacteria to grow and thrive in the presence of potential toxins.
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During the Beagle journey, Darwin visited islands, allowing him to compare island species with continental species. In terms of framing his theory of evolution, why was this significant?
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments. B. Because the island species no longer shared traits with their continental ancestors. C. Because the species he saw on the islands had not changed from their ancestral continental form. D. Because the island species had very low reproductive and survival rates as compared with their continental ancestors.
The evolution of ________ caused the death of many anaerobic organisms, and in their place evolved new aerobic organisms
Fill in the blank(s) with correct word
Several epidemic microbial diseases of earlier centuries incurred high death rates because they resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatal because we have developed which of the following?
A) antiviral medications that are efficient and work well with most viruses B) intravenous feeding techniques C) medications to slow blood loss D) hydrating drinks with high concentrations of salts and glucose
The term filterable viruses was coined by
A. Beijerinck. B. Iwanowsky. C. Twort. D. d'Herelle.