In this figure showing SDS-PAGE of the progressive stages of glycine N-methyltransferase purification, the 14,000 MW protein most likely disappears from the sample because gel-exclusion chromatography differentiates proteins by:
A. charge-to-mass ratio.
B. mass.
C. charge.
D. solubility.
E. specific affinity to resin.
B
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Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters B) require multiple RNA polymerases for transcription C) reproduce without increasing the fitness of the host D) do not produce mRNA
The possible effect of failing to limit greenhouse gas emissions on the oceans is likely to be which of the following?
A. An increase in dissolved carbon dioxide will raise the pH. B. An increase in dissolved methane will stimulate microbial growth. C. An increase in dissolved carbon dioxide will lower the pH. D. An increase in dissolved methane will hinder microbial growth.
Which of the following is a consequence of smoking? a. All of these choices are consequences of smoking
b. Increased susceptibility to colds. c. Cilia in the respiratory tract are paralyzed. d. Increased production of pathogens. e. White blood cells are destroyed.
The Krebs cycle takes place in the
a. ribosomes. b. cytoplasm. c. nucleus. d. mitochondria. e. chloroplasts.