In order to visualize the fine structure of viruses and cytoskeletal filaments at 10-25 nanometers in diameter the type of microscopy that would be most effective is
A. standard light microscopy.
B. phase-contrast light microscopy.
C. transmission electron microscopy.
D. darkfield light microscopy.
E. differential-interference microscopy.
C. transmission electron microscopy.
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Review the ABC model for flower development in Arabidopsis shown below. Which of the following statements about the ABC model is incorrect?
A. Activity A alone results in the formation of sepals. B. Activity A and B together result in the formation of petals. C. Activity B and C together result in the formation of stamens. D. Activity C alone results in the formation of carpels. E. If activity B is missing, only petal formation will be affected.
Allopatric speciation typically occurs in two stages. The first stage is ____ of two populations and the second stage is
____.
a. geographic separation; reproductive isolation b. natural selection; geographic separation
c. mutation; reproductive isolation d. reproductive isolation; geographic separation e. genetic drift; reproductive isolation
Monocots and eudicots differ in how xylem and
phloem are distributed in ground tissue, in the number of petals in flowers, and in the number of __________. Fill in the blank(s) with the appropriate word(s).
During clotting, what happens to the plasma protein fibrinogen?
What will be an ideal response?