Isotopes are atoms of the same element with the same umber of protons and
a) a different number of electrons
b) a different number of molecules
c) a different numbers of neutrons
d) the same number of neutrons
Ans: c) a different numbers of neutrons
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Which class of antibody accounts for the bulk of the circulating antibody?
A. IgA B. IgD C. IgG D. IgE
The evolutionary mode in which species evolve rapidly at first and then remain stable for very long periods of time is
called ____.
a. catastrophism b. uniformitarianism c. disruptive selection d. punctuated equilibrium e. phyletic gradualism
The process in which neighboring cells influence the development of each other, either by direct contact or by production of chemical signals, is called
A. maternal determinants. B. induction. C. neurulation. D. gastrulation. E. homeotic pattern formation.
Examples of mollusks that live on land are the
A. land crabs. B. scorpions. C. mussels. D. snails and slugs. E. earthworms.