Three types of cytoskeleton are ___, ___ and ___
Fill in the blank(s) with the appropriate word(s).
Answer: microtubule, microfilament and intermediate filament
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While walking through the forest, you discover a tree covered in shelf fungi. Although you are unable to determine whether the tree is alive, dead, or dying, you know that shelf fungi are potentially pathogenic and may already have caused significant harm to this particular tree. Nevertheless, you resist the urge to knock down these shelf fungi; why?
a. Shelf fungi also cause warts in humans when touched or inhaled.
b. It would release spores that would infect all of the other trees in the area.
c. The shelf fungi will return valuable nutrients to the forest ecosystem.
d. Damaging shelf fungi causes them to redouble their metabolic rate.
Local and long-distance signals in cells will trigger
changes in a. metabolism. b. gene expression. c. growth. d. development. e. any of these.
An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?
A) transporting ions against an electrochemical gradient B) cell-cell recognition C) attaching the plasma membrane to the cytoskeleton D) establishing a diffusion barrier to charged molecules
What is the main reason that sex-linked disorders are most often observed in males?
A.) The X chromosome only has genes for genetic disorders. B.) The Y chromosome cannot have genes that cause genetic disorders. C.) The Y chromosome cannot mask alleles on the X chromosome. D.) The X chromosome has genes only for sex determination.