An hypothesis currently getting a lot of
attention concerning the origin of biological
molecules is that they originated
a. in hot springs.
b. near volcanoes.
c. near hydrothermal oceanic vents.
d. in salt lakes.
e. in tidal pools.
C
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The number of neural cells in the cerebral cortex decreases during the aging process.
Answer the following statement true (T) or false (F)
Which type of mutation converts a nucleotide to an alternative structure with the same composition but a slightly different placement of rare, less stable hydrogen bonds that cause base-pair mismatch?
A) depurination B) deamination C) tautomeric shift D) transition E) transversion
Which of the following reflect(s) the likely presence of (a) gene mutation(s)?
A. Fruit flies subjected to intense radiation produce a wider array if variable offspring B. A chemical leaking from the surface of an old abandoned coal mine alters a regulatory gene so that a cricket nymph develops an extra set of eyes C. The bacteria that cause gonorrhea, a common sexually disease, have previously been killed by penicillin; however, after continuous usage of the antibiotic, penicillin- resistant strains are now becoming prevalent D. Radiation causes an alternation in a DNA nucleotide sequence, which is discovered when mapped, but which appears to be neither increasing nor decreasing in successive generations E. All of the choices are correct
An explanation for the evolution of insect wings suggests that wings began as lateral extensions of the body that were used as heat dissipaters for thermoregulation. When they had become sufficiently large, these extensions became useful for gliding through the air, and selection later refined them as flight-producing wings. If this hypothesis is correct, insect wings could best be described as
A) adaptations. B) mutations. C) exaptations. D) isolating mechanisms. E) examples of natural