Describe two features of a plasmid
What will be an ideal response?
two of the following: circular; double-stranded DNA; autonomous; includes genes
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The peripheral nervous system ____
a. carries signals to and from the central nervous system b. is composed of the brain and spinal cord c. is composed of clusters of neuron cell bodies
d. includes sensory neurons only e. is present in radial invertebrates
Hormones are a class of signaling molecule carried by the ___________________ to target cells. Fill in the blank(s) with the appropriate word(s)
Sensory neurons release glutamate and neuropeptides such as __________ to enhance the effect of
glutamate. a. GABA b. substance P c. serotonin d. norepinephrine e. adrenalin
In the fall, the leaves of some trees change color. This happens because chlorophyll breaks down and the accessory pigments become visible. What hormone is responsible for this?
A) phototropin B) abscisic acid C) cytokinin D) ethylene