You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. You can be sure that this bacterium is
A) gram-positive.
B) using anaerobic respiration.
C) a chemoautotroph.
D) a photoautotroph.
E) a photoheterotroph.
B
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During the first meiotic division
A) spermatogonia and oogonia form. B) homologous chromosome pairs separate. C) homologous chromosome pairs join. D) the cell becomes diploid.
The group of organic molecule polymers with the most complex and diverse three-dimensional structure is
A. unsaturated fats. B. proteins. C. waxes. D. carbohydrates. E. saturated fats.
Natural selection would appear to act against long tails in male red-collared widowbirds, given that longer tails reduce body condition over the mating season
Based on the experiments of Pryke and Andersson (2005 ), why do long tails appear to be favored despite their obvious disadvantage?
Messenger RNA codons pair with tRNA anticodons at which cell structure?
What will be an ideal response?