The _____ model proposed by Jacob and Monod explains gene regulation in prokaryotes.
a. endosymbiotic
b. fluid mosaic
c. cohesion-tension
d. operon
Ans: d. operon
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A medium that inhibits the growth of organisms other than the one being sought is termed a(n)
A. synthetic medium. B. specific culture medium. C. selective medium. D. enrichment medium.
What are the two important symbiotic relationships involving plant roots?
What will be an ideal response?
The formation of amino acids under abiotic conditions was important because they serve as ____
a. a supply of structural units for proteins b. enzymes to catalyze reactions c. subunits in the formation of DNA d. subunits in the formation of RNA e. subunits for the formation of lipids
Lamarck believed
a. that a substance called fluida moved through the nerves to areas of the body in need of change. b. in the inheritance of acquired characteristics. c. that giraffes’ necks elongated in response to stretching. d. that environmental pressures bring about changes in organisms. e. all of these were true.