Courtship is often dependent on what?
A. An alarm call
B. A stimulus/response chain
C. Size and colors
D. Social releasers
E. Taxis
Answer: B
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Restriction enzymes are an essential component of PCR
A. true B. false
Hydrophobic interactions:
A. arise from the tendency of nonpolar molecules to exclude water in solution. B. destabilize proteins. C. destabilize the base-stacking interactions of DNA helices. D. occur between molecules having partial charges. E. are a function of the repulsive forces generated when atoms are closer than their van der Waals radii.
The nutrition of some plants depends on a mutually beneficial association between a root and a fungus. The association is known as a _____
a. root nodule c. root hair b. mycorrhiza d. root hypha
Planarians lack dedicated respiratory and circulatory systems because _____
A) none of their cells are far removed from the gastrovascular cavity or from the external environment B) they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm C) their flame bulbs can carry out respiratory and circulatory functions D) their body cavity, a pseudocoelom, carries out these functions