What phase does it occur when spindle apparatus appears?
What will be an ideal response?
Metaphase I
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A neuron synthesizes and secretes substance D, which binds to a receptor on the neuron cell membrane, triggering an
influx of calcium. Substance D therefore is a ligand for a ____.
a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase
Allopatric speciation
1.occurs when two populations exist in the same place. 2.occurs when two populations become separated geographically. 3.occurs only in plants. 4.is not very common. 5.never happens in animals.
Which diagram, A, B, C, or D, illustrates paracrine signaling?
1.A
2.B
3.C
4.D
The transfer of heat from the plant to the surrounding environment is influenced by the existence of the ________ layer
Fill in the blank(s) with correct word