Put the following events in epinephrine signaling through the beta-adrenergic receptor in order. activation of cellular responses leads to smooth muscle relaxation The G protein subunits dissociate from one another PKA catalyzes the phosphorylation of proteinsAdenylate Cyclase catalyzes the conversion of ATP to cAMP Epinephrine binds to a p-adrenergic receptor on a smooth muscle cell cAMP activates protein Kinase A Binding causes a conformational change in the receptor The a subunit activates Adenylate Cyclase

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material