The type of microscope in which you would see brightly illuminated specimens against a black background is
A) Fluorescence
B) Phase-contrast
C) Electron
D) Bright-field
E) Dark-field
E) Dark-field
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True or false: In the presence of ADH, urine becomes more concentrated
A. true B. false
The tight packing of chromatin into the chromosomes visible during nuclear division is possible due to links between
____ proteins.
a. Cdk b. H1 histone c. H3 histone d. H4 histone e. nonhistone
Which of the following is least likely to be a cause of extinction?
a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
Which of the following were instrumental in DISPROVING spontaneous generation?
a. Pasteur's experiments using a specialized swan-necked flask that prevented microbes from entering flasks open to the air. b. The theory set forth by Rudolph Virchow, stating that living cells arise only from preexisting cells. c. Needham's experiments showing that even boiled vials of meat broth, when covered, became cloudy, teeming with microorganisms after a few days. d. Spallanzani's experiment in which flasks of meat broth were boiled and then melted shut, preventing the passage of air altogether.