Describe the events that occur during the synthesis (S) phase of the cell cycle.
a) a cell leaves the cell cycle and ceases to divide
b) a cell makes a duplicate copy of its centrioles and all of its nuclear DNA
c) a cell synthesizes enzymes that control cell division as well as checks and repairs the newly copied DNA
d) the nucleus divides
b) a cell makes a duplicate copy of its centrioles and all of its nuclear DNA
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The smallest neuroglia of the CNS that act as phagocytes are the
A) astrocytes. B) ependymocytes. C) microglia. D) oligodendrocytes. E) tanycytes.
________________________________________ is the process that interlocks the fibers of sheep wool under heat, moisture, or pressure
Fill in the blank(s) with correct word
Compare olfactory receptors with receptors for the other special senses
A) Olfactory receptors are at the surface of the olfactory epithelium and can generate a fast action potential, whereas receptors for the other special senses are deep and slower to generate an action potential. B) Olfactory receptors are chemoreceptors and respond to dissolved chemicals, whereas the receptors for the other special senses are mechanoreceptors. C) Olfactory receptors have short axons because of their close proximity to the olfactory bulb, whereas the receptors for the other special senses have long axons because they are further away from the CNS. D) Olfactory receptors do not require the CNS for processing the signal, whereas the receptors for the other special senses require processing by the CNS. E) Olfactory receptors are the dendrites of specialized excitable olfactory neurons, whereas the receptors for the other special senses are receptor cells with inexcitable membranes and form synapses with the processes of sensory neurons.
Gastrulation results in the formation of a(n)
A. morula. B. embryo. C. blastocyst. D. trophoblast. E. umbilical cord.