Present a detailed description of the actions of the regulatory proteins in inducible and repressible enzyme systems
What will be an ideal response?
Inducible system: The repressor is normally active, but the inducer inactivates the repressor. Repressible system: The repressor is inactive, but is activated by the corepressor. Active repressors turn off transcription.
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Many species of ants "farm" aphids, protecting them from predation and collecting concentrated sugars (i.e. honeydew) from them. This type of ant/aphid relationship is known as
A. dispersive mutualism. B. defensive mutualism. C. parasitism. D. trophic mutualism. E. commensalism.
How does the spiral valve within the shark intestine increase the efficiency of food digestion?
What will be an ideal response?
Oxytocin is produced in the ___ and causes
___.
a. anterior pituitary--milk to move into mammary glands b. posterior pituitary--childbirth muscle contractions c. hypothalamus--childbirth muscle contractions d. hypothalamus--the fight or flight response e. anterior pituitary--glucose uptake by cells of the pancreas
A rod-shaped bacterium’s length of 1.50 ?m can
also be expressed as a. 0.0015mm. b. 0.00015cm. c. 1.5x10-6m. d. 1.5x10-4cm. e. all of these.