The base A on one strand of DNA always hydrogen-bonds to a(n) ___ on the other strand.
What will be an ideal response?
Answer: T
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A fruit fly homozygous for wild-type eyes and straight wings was crossed with a fly homozygous for rosy eyes and wrinkled wings. The progeny all showed wild-type eyes and straight wings
When crossing the F1, the resulting offspring showed 3 wild-type eyes/straight wings : 1 rosy eyes/wrinkled wings. This data suggest: A. rosy eyes is dominant. B. straight wings is recessive. C. these two genes are linked. D. these two genes are sex-linked. E. these two genes are codominant.
_________ is believed to be the first national park in the world.
A. Glacier National Park B. Yellowstone National Park C. Banff-Jasper National Park D. Yosemite National Park E. Great Smoky Mountains
Complex tissues are tissues consisting of ____.
A. two or more cell types B. only one cell type C. only parenchyma cells D. only collenchyma cells E. only sclerenchyma cells
A sick child may have influenza or RSV. These virus infections have different treatment options, so the physician requests antibody titer tests. The results are as follows: anti-influenza antibodies are primarily IgM, and anti-RSV antibodies are all IgA and IgG. Which of the following is the most appropriate interpretation?
A) The child has a current RSV infection and was previously exposed to influenza. B) The child currently has influenza and has previously been exposed to RSV. C) The child has concurrent influenza and RSV infections. D) The child has neither influenza nor RSV. E) The results do not provide sufficient data to draw a conclusion.