Recall the Bartel lab group experiment to create a ribozyme from scratch. If they had created exact copies of each ribozyme (rather than creating copies with a few differences), the ribozymes would have _____
A) become more efficient with each round of selection
B) stayed the same with each round of selection
C) become less efficient with each round of selection
D) stopped catalyzing reactions after just a few rounds of selection
Answer: B
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Adaptive immunity refers to the type of specific immunity that
A. develops after exposure to antigen. B. can be induced by natural or artificial means. C. can result from transfer of antibodies from one individual to another. D. All of the choices are correct.
The geologic time scale is often subdivided on the basis of ____
a. the appearance of different radioactive isotopes in different strata b. levels of background extinction c. periods of mass extinction d. the appearance of new species e. climate change
Fragile X syndrome and Huntington disorder are examples of what type of mutation?
a. frameshift b. base-substitution c. expansion d. transposable element e. point
Endocrine glands secrete their products
A) into a synapse. B) into a gap junction. C) into ducts that open into a body cavity. D) into interstitial fluid. E) directly into target cells.