Scientists are working to create a better biofuel factory through which of the following processes?
A) increasing the rate at which certain algae reproduce
B) developing strains of algae that can clean up oil spills
C) increasing the genetic diversity of groups of algae
D) restricting hydrocarbon production
C
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The nitrogen cycle on land begins with
a. nitrification. b. denitrification. c. decomposition. d. uptake by producers. e. nitrogen fixation
In the unlikely event that a tRNA has been charged with the wrong amino acid, what high-fidelity enzyme is likely to blame?
A) peptidyl transferase B) DNA polymerase I C) DNA polymerase III D) aminoacyl synthetase E) aminoacyl peptidase
Which of the following provides evidence that mitochondria and chloroplasts were once free-living prokaryotic organisms?
A) They contain nucleoids. B) They contain their own DNA, independent of the nucleus. C) They capture the energy of sunlight to make ATP. D) They produce digestive enzymes on their rough ER.
During active transport, the solutes in the solution can be described as
a. moving from high concentration to low concentration. b. moving toward equilibrium. c. moving from low concentration to high concentration. d. moving down their concentration gradient.