The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?
A) a covalent bond
B) a hydrophilic bond
C) a van der Waals interaction
D) a hydrogen bond
E) an ionic bond
Ans: D) a hydrogen bond
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Give an example of an acute and a chronic carrier of disease. What disease characteristics allow for chronic carriers to play significant roles in the spread of the disease? How are diseases with chronic carriers controlled?
What will be an ideal response?
Plants and animals that rely on diffusion to move molecules through their bodies tend to ________
a. be large b. have respiratory and vascular systems c. be small and flat d. evolve few adaptations because diffusion is a passive process
Light microscopes
A) typically provide more resolution than an electron microscope. B) work by reflecting electrons off the surface of an object being studied. C) use light and glass lenses to magnify an image. D) are generally not used to view bacteria.
Scorpions have a prosoma, pedipalps that are modified into claws, and chelicerae. Which taxonomic group are they a member of?
A. Hexapoda B. Crustacea C. Chelicerata D. Myriapoda