What external factors influence a cell to divide?
What will be an ideal response?
A variety of external chemical and physical factors can influence cell division. Particularly important
for mammalian cells are growth factors, proteins released by one group of cells that stimulate other
cells to divide. Each cell type responds specifically to a certain growth factor or combination of
factors.
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Vibrations from the tympanic membrane to the oval window are transmitted by the structures at which numbers?
A) 1, 2, 3, and 4 B) 2, 3, and 4 C) 3 and 4 D) 4 E) 5
A transport system in which transport of an ion in one direction provides the energy for active
transport in the opposite direction is known as ____.
a. antiport b. active diffusion c. symport d. cotransport e. osmosis
As part of observation in your scientific method, you discover that your strawberry plants are producing plantlets that are identical to the parent plant. This demonstrates that they reproduce by
A. development and maturation. B. fragmentation. C. development and adaptation. D. sexual reproduction. E. asexual reproduction.
Transmission and scanning electron microscopy differ because
A. transmission electron microscopy has much higher magnification than scanning electron microscopy. B. transmission electron microscopy shows contrast, but scanning electron microscopy does not. C. transmission electron microscopy shows two-dimensional ultrastructure, while the scanning electron microscopy shows three-dimensional structure. D. transmission electron microscopy uses light as an illumination source, while scanning electron microscopy uses electron beams as an illumination source. E. transmission electron microscopy has high resolution, but scanning electron microscopy does not.