Describe the unique nature of hydrogen bonds, and how this makes water such a unique, and biologically important molecule
What will be an ideal response?
Water, with two hydrogen atoms and one oxygen atom, tends to form hydrogen bonds with adjacent water molecules. The slightly electronegative oxygen atom attracts the slightly electropositive hydrogen atom of an adjacent water molecule. These are very important, but very transient bonds. Hydrogen bonding results in many of the unique characteristics of water, such as ice floating and water forming "beads," and is an important component of the structure of DNA. Further, water dissolves polar compounds and most ionic compounds.
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Which form of reproduction in protists is associated with a protective, resting cyst stage?
a. transverse binary fission b. longitudinal binary fission c. sexual reproduction d. budding
The difference between the terms pathogenicity and virulence is that
A. pathogens cause disease and their virulence describes the degree of pathogenicity. B. virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations. C. virulent organisms cause disease, pathogens do not. D. pathogenic organisms cause disease, virulent organisms do not.
Plants have specific temperatures (or temperature ranges) that allow for maximum growth. A process by which heat from ________ is transferred from the sun to leaves helps give plants these ideal temperatures
A) convection B) evaporation C) conduction D) radiation
When is quarantine an effective tool to limit disease?
A) when the disease has a short incubation time B) when there is not enough funding for public education campaigns C) when the population it too dense or poor for vector control to work D) when the population is too spread out for vector control to be cost effective E) when the disease has a long incubation time