Which microscope takes advantage of differences in the refractive indexes of cell structures?
A) compound light microscope
B) phase-contrast microscope
C) darkfield microscope
D) fluorescence microscope
E) electron microscope
B
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At this time, EIA tests are too difficult for routine diagnoses
Indicate whether the statement is true or false.
Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over
b (brown). D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what will result from a F1 cross between two mice?
a. 9/16 black, 3/16 brown, 4/16 white b. 9/16 white, 3/16 brown, 4/16 black c. 9/16 black, 6/16 brown, 1/16 white d. 9/16 white, 6/16 brown, 1/16 black e. All black mice
In a class field trip, you scrape what looks like an organism off of a stream rock. Through the semester, with chemical analysis and electron microscopes, you determine that the cell has DNA, RNA, ribosomes, a cell membrane, and cytoplasm. This helps you determine that
A. this is an unusual plant that you collected from the stream. B. this organism you collected is in the Eukarya domain. C. this organism you collected is in the Bacteria domain. D. this organism you collected is in the Archaea domain. E. this is an organism with cells having common features with all life.
Division of eukaryotic cells into two identical cells is
called a. growth. b. meiosis. c. mitosis. d. asexual reproduction. e. all of these.