Which of the following processes is not involved in the hydrologic cycle?
a. chemosynthesis
b. transpiration
c. precipitation
d. evaporation
e. condensation
A
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When performing 2-D gel electrophoresis, what is the purpose of exposing the proteins to sodium dodecyl sulfate (SDS)?
A. SDS masks all of the proteins' native charge with a positive charge. B. SDS masks all of the proteins' native charge with a negative charge. C. SDS makes all of the proteins' the same molecular weight. D. SDS adds a hydroxyl group to amino acid residues on each of the proteins. E. SDS masks all of the proteins' native charge with a neutral charge.
Which was the first bacterium to be clearly identified as the cause of an infectious disease?
a. Legionella pneumophila, which causes Legionnaires' disease b. Chlamydia sp., which causes pelvic inflammatory disease in women c. Clostridium botulinum, which causes botulism d. Bacillus anthracis, which causes anthrax e. Vibrio cholerae, which causes cholera
During mitosis, which of the following normally occurs?
a. Homologous chromosomes pair. b. Replicated chromosomes line up on the equatorial plate. c. Tetrads form. d. Unreplicated chromosomes become oriented in the center of the cell. e. Maternal and paternal chromatids pair.
What do we mean when we say that facilitated diffusion is specific?
a. A protein will transport specific molecules. b. One specific integral protein per membrane is involved in facilitated diffusion. c. Only specific hydrophobic molecules can be transported. d. The energy molecule ATP is specifically required for transport.