Gap junctions in cells
a. prevent fluid leakage between adjacent cells.
b. are used only to stimulate cellular reproduction.
c. allow ions to pass between adjacent cells.
d. only occur in muscle tissue.
e. do none of these.
Answer: c
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The acid-fast stain
A. reflects differences in cytoplasmic membrane structure. B. is useful for distinguishing a small group of organisms, including Mycobacterium. C. uses crystal violet and safranin. D. uses carbolfuchsin and methylene blue. E. is useful for distinguishing a small group of organisms, including Mycobacterium AND uses carbolfuchsin and methylene blue.
During metaphase, ________
A) the nuclear envelope breaks up B) sister chromatids separate C) centromeres divide D) chromosomes line up in the middle of the cell
Erwin Chargaf demonstrated that in DNA the amount of A is about the same as the amount of G
a. true b. false
Which type of speciation can occur when a population encompasses a vast territory that includes a variety of habitats?
a. Sympatric b. Stabilizing selection c. Gene flow d. Parapatric speciation e. Allopatric