When is a cell in metaphase?
a. The chromosomes are visible as threadlike structures.
b. The nuclear envelope is clearly visible.
c. The chromosomes are aligned at the midplane of the cell.
d. The chromosome are separated into distinct groups at opposite poles of the cell.
e. Cytokinesis is occurring
c
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Epileptic seizures, headaches, and mental disturbances all result from infection with the Taenia solium organism. The definitive diagnosis is based on:
a. positive direct fluorescent antibody test. b. observance of eggs in the stool. c. positive India ink stain. d. identification of cysts in tissue.
Which type of soil has the best oxygen and water penetration to support plant growth?
a. sand b. silt c. loam d. clay e. humus
The "background" species extinction rate
A. estimates how many extinctions humans are causing. B. estimates how quickly species disappeared before human intervention. C. measures today's extinction rate of animals. D. measures today's extinction rate of plants. E. All of the answer choices are correct.
Cell division of cocci in several planes produces a ________ arrangement.
A) streptococcal B) staphylococcal C) streptobacilli