This animal has the most complex eye of any
invertebrate and an opening that allows light
into a dark chamber. This animal is a(an)
a. lobster.
b. earthworm.
c. sea star.
d. squid.
e. planarian
D
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For bacteriophages and animal viruses ________ is the step in the viral life cycle that determines host cell or tissue specificity
A) attachment B) penetration C) synthesis D) assembly
In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the regions of Spirogyra algae that were bathed in red, blue, and violet light?
a. Chlorophyll is green and thus reflects green light. b. The bacteria were immobile and that is where Engelmann happened to place them. c. Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions. d. Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions. e. The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultra violet and infrared).
Localized redness and swelling, along with warmth and pain are associated with which of the following?
a. the adaptive immune response b. the natural killer cell response c. the inflammatory response d. the complement response
It takes a __________ workforce to support
individuals in the __________ age brackets. a. large; higher b. large; lower c. small; lower d. small; higher e. large; middle