Elongation of nucleic acids always occurs in the 5' 3' direction
A. true
B. false
A
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In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with virus. 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.
The scientific method involves formulating a tentative explanation, called the hypothesis, to account for what has been observed or measured.
Answer the following statement true (T) or false (F)
Cocklebur will not flower if exposed to 8 hours of dark and 16 hours of light. It will flower if exposed to 16 hours of dark and 8 hours of light. However, if the 16 hours of dark is interrupted with a brief period of light, the cocklebur will not flower. Which of the following will trigger cocklebur to flower?
A. short dark periods B. short light periods C. long dark periods D. None of the answer choices is correct. E. long light periods
The stripes in skeletal muscle are due to the presence of
A. intercalated disks. B. the branching of cells. C. multiple nuclei per cell. D. actin and myosin filaments. E. tendons connecting the muscle to bone.