Identify the ganglion cell layer
a) A
b) B
c) C
d) D
d
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Sexual differentiation of the embryo is normally determined by:
A. the number of chromosomes, with males having 22 pairs and females having an extra pair of XX chromosomes. B. the presence of two X chromosomes, which causes the primordial testes to degrade. C. the presence of one Y chromosome, which causes the primordial ovaries to degrade. D. the presence of the Y chromosome, which directs the undifferentiated gonads to develop into testes (when there is one X chromosome present as well). E. hormones produced by the placenta.
The special sense that humans typically rely upon more than any other is the sense of ________.
Fill in the blank(s) with the appropriate word(s).
A nerve cell and a muscle cell have the same genes, but express different subsets of them.
Answer the following statement true (T) or false (F)
The regions of axon membrane that lie between regions of myelin are the
A. ganglia. B. nodes of Ranvier. C. synaptic membranes. D. glial cells. E. pia mater.