Each water molecule is joined to _____ other water molecules by ______________ bonds.
a) two ... polar covalent
b) four ... hydrogen
c) three ... ionic
d) four ... polar covalent
e) two ... hydrogen
4
hydrogen
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Why are flu vaccinations recommended for individuals on a yearly basis?
a. Live viral vaccines revert to disease-causing forms after a year if not replaced. b. The body cannot create new flu antibodies, so they must be replaced yearly. c. Mutations alter viral markers, rendering previous vaccination ineffective. d. Yearly vaccinations allow scientists to track which vaccinations were effective.
What does the model of hybrid dysgenesis predict for the F1 and F2 generations when an M-cytotype male is crossed to a P-cytotype female?
What will be an ideal response?
After forest harvest in an old-growth forest of the Oregon Cascades, an ecologist noted that the species that were present after 5 years differed from the species that were present 25 years later, and these differed from the species that were present
75 years later. What are the general characteristics of the species at each stage, and why does the community change over time?
The sequencing and analysis of an organism's genetic information is called
A. protein synthesis. B. gene therapy. C. genomics. D. northern blotting. E. PCR.