In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with a retrovirus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes.
B) the presence of viroids.
C) the presence of retrotransposons.
D) infection with small bacteria known as mycoplasmas.
E) a novel prion infection.
Answer: C
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A) The atrioventricular valves close B) Atria contract, causing blood to fill the ventricles C) The ventricles contract
Campylobacter jejuni subsp. jejuni grows best at what conditions?
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A promising means of improving conditions for patients with type-2 diabetes may be ____
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A plant takes up nutrients like ammonium nitrate to maintain
A. sexual reproduction. B. evolution. C. asexual reproduction. D. natural selection. E. homeostasis.