What was the purpose of the spark chamber in this experimental apparatus?
a. To generate heat
b. To produce ATP
c. To stop the reaction
d. To generate lightening
e. To produce UV radiation
ANSWER: d
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Which one of the following terms applies to the phylum Arthropoda?
A. radial symmetry B. diploblastic C. coelomate D. Parazoa E. deuterostome
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. What assumption were the scientists making to conclude that when pressure was zero, the plant could grow no further?
A. Turgor pressure would be greater than gravity. B. Transpiration would be less than uptake of water from the xylem. C. Leaves above that point would not receive any sunlight. D. Leaves above that point would not receive any water. E. Stems above that point could not transport sugars in their xylem.
Which biochemical unit encodes a single protein?
Cancer cells often fail to respond to certain hormones because they lack these cell membrane features important in binding with those specific hormones
A) dockers B) targets C) receptors D) DNAs