The ara operon is an inducible operon that controls the production of the sugar arabinose. when arabinose is present in a bacterium it binds to the protein arac, and the complex binds to the initiator site to promote transcription. in this scenario, arac is a(n)
activator
inducer
repressor
operator

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

What characteristic make legumes a good food source for food insecure populations

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.