A trait that is adaptive in one context and later turns out to have adaptive value in a different context is called ____
a. paedomorphic
b. heterochronic
c. allometric
d. an exaptation
e. endemic
ANSWER: d
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A. the outer end of each arm of the Y. B. the junction of heavy and light chains. C. different regions depending on the class of antibody. D. the bottom stem of the heavy chain of the Y.
The breaking of the hydrogen bonds in DNA is not necessary for DNA replication to occur. Indicate whether the statement is true or false
C4 plants conserve water by ________
A) shuttling CO2 from the Calvin cycle to the water-splitting photosystem B) keeping their stomata closed when the weather is hot and dry C) growing very deep roots D) running the Calvin cycle at night
Interphase is an uneventful resting stage of the cell division cycle.
a. true b. false