Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide
b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide
c. divide continuously and never transition to G0
d. mutate into other cell types by signals from bone marrow cells
e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
a
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The fovea is the area of the retina:
A. where the optic nerve attaches to the retina, and that doesn't have any rods or cones B. where all blood vessels merge with the retina C. associated with high concentrations of cone cells, and that corresponds to the center of the visual field in most vertebrates D. that contains mostly rod cells, and explains why peripheral vision is limited at night
Which tissue type will move the body? a. Muscle b. Nerve c. All of these choices
d. Epithelial e. Connective
The immune system component with a principal role at point B in the accompanying figure is:
a. memory cells. b. IgM antibodies. c. IgG antibodies. d. cytotoxic T cells. e. antibody IgA.
What is the relationship between the Golgi apparatus and the plasma membrane?
A. The plasma membrane stops the products of the Golgi apparatus from leaving the cell. B. The membranes of the Golgi apparatus and the plasma membrane are continuous. C. The finished products of the Golgi apparatus may leave the cell through vesicles that fuse with the plasma membrane. D. The Golgi apparatus begins the formation of the lipids that make up plasma membranes.