The replication of a DNA molecule results in:
A) four unwound DNA strands.
B) two DNA molecules, one being made of the old strands and one being made of two new strands.
C) two DNA molecules, each with one old and one new strand.
D) two DNA molecules, both of which are made of completely new strands.
Answer: C
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Infection with Streptococcus pyogenes (bacterium that causes strep throat) may generate antibodies or T cells that react with heart muscle, which has a similar structure to the surface of S. pyogenes. These antibodies can damage heart muscle with autoimmune attacks, leading to rheumatic fever. This is an example of which of the following?
a. immunodeficiency b. delayed hypersensitivity c. autoimmune molecular mimicry d. immediate hypersensitivity
What microbe is responsible for crown gall disease in plants and is used to create transgenic plants incorporating Ti vectors?
A) Thermus aquaticus B) Agrobacterium tumefaciens C) Bacillus thuringiensis D) Escherichia coli E) Saccharomyces cerevisiae
Describe the mutagenic action of the following two mutagens: 5-bromouracil and ultraviolet light
What will be an ideal response?
A primary advantage of using integrated nutrient management compared to inorganic chemical fertilizers is that
A. chemical fertilizers are not soluble in water. B. chemical fertilizers break down very slowly. C. less organic fertilizer is needed than chemical fertilizers. D. only organic fertilizers contain micronutrients. E. organic fertilizers release nutrients more slowly.