All of the following characterize the sympathetic nervous system except : A. it corresponds to "rest and digest" responses
B. it originates in the thoracic and lumber regions of the spinal cords
C. it is part of autonomic nervous system
D. it has norepinephrine as its postganglionic neurotransmitters
E. it has acetylcholine as its preganglionic neurotransmitters

Structures in cells that carry out specific functions.

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.