In biological nitrogen-fixation,
a. ammonia is converted to nitrogen gas.
b. nitrogen gas (N2) is converted to ammonia (NH3).
c. ammonia is converted to nitrate.
d. amino acids are linked into proteins in ribosomes.
e. nitrate is converted to ammonia.
B
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Which of the following was the dominant
theory of inheritance before Mendel?
a. blending of traits b. acquired characteristics c. natural selection d. spontaneous appearance e. paternal dominance
A(n) ____ character is a trait that has evolved relatively recently
a. derived b. ancestral c. cladistic d. homologous e. polyphyletic
Which of the following was NOT proposed by Lamarck's theory of evolution?
a. Changes in species are a result of natural selection. b. Organisms change in response to their environment. c. New characteristics are passed from one generation to the next. d. Species change through time.
Which one of the following is a characteristic of the adaptive immune system?
A. it acts immediately or within hours of appropriate stimulus B. it involves granulocytes (myeloid white blood cells) C. its response is enhanced on repeated exposure to antigen/pathogen D. it involves one type of large, granular lymphocytes also known as natural killer cells E. it involves macrophages