This describes which parasomnia? It may involve movement, occurs during the first 1/3 of the night, and the individual will have little or no memory of the event?
-Somnambulism
-Sleep terror
-Rem behavior disorder
-Both A and c (somnambulism and REM behavior Disorder)
-Both A and c (somnambulism and REM behavior Disorder)
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The whole-genome shotgun approach is useful for sequencing small bacterial genomes but has failed in the case of larger eukaryotic genomes such as those of Drosophila and human.
Answer the following statement true (T) or false (F)
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
The function of helicase enzymes is to
a. break hydrogen bonds and unwind the two strands of the DNA molecule prior to replication. b. rewind the two DNA molecules after replication. c. remove bases that might have been inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell.
Assuming that the rate of sea-floor spreading was constant during the one-million-year period depicted above, on average Earth's magnetic field has undergone reversal once every _____
A) 25,000 years B) 100,000 years C) 250,000 years D) 1,000,000 years