Rapid sand filtration, used in many water purification plants, is sufficient to ensure that Giardia will be consistently removed.
Answer the following statement true (T) or false (F)
False
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When considering the wormlike phyla within the protostomes, which feature is most useful in distinguishing groups?
A) the type of body cavity B) the presence or absence of a hemocoel C) feeding structures or mouthparts D) presence of a hydrostatic skeleton
Attachment of a bacteriophage to its host requires
A. specific surface proteins on the bacteriophage and specific receptor molecules on the host cell. B. nucleic acid protein interactions. C. specific receptor molecules on the host cell. D. specific surface proteins on the bacteriophage.
In Figure 8.2, if base 4 is thymine, what is base 4'?
A) Thymine B) Guanine C) Cytosine D) Adenine E) Uracil
Contraction of the diaphragm ____.
A. diminishes the volume of the thoracic cavity B. increases the volume of the thoracic cavity C. pushes the rib cage downward D. causes external intercostal muscles to relax E. decreases lung capacity