The process of evolutionary changes that result in formation of new species and groups of species is called
A. temporal evolution.
B. artificial selection.
C. macroevolution.
D. serial evolution.
E. a combination of temporal and serial evolution.
C. macroevolution.
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Why is it necessary to include the ?-galactosidase gene in a BAC?
A. ?-galactosidase is a negative selectable marker. B. ?-galactosidase is a positive selectable marker. C. ?-galactosidase confers resistance to several antibiotics. D. Presence of ?-galactosidase indicates cloned DNA segment is present. E. Absence of ?-galactosidase indicates cloned DNA segment is present.
Biochemical reactions that combine molecules are called ________
a. electron transfer b. cleavages c. condensations d. rearrangements
Regarding the lactose utilization system in E. coli, a constitutive mutant is one in which the three enzymes are produced regardless of the presence or absence of lactose
Indicate whether the statement is true or false
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