Kleckner and coworkers discovered a protein bound to the 5' termini of double-stranded breaks
In their effort to purify and identify this protein, what did they do to amplify the signal (enrich the number of covalently bound complexes), and which protein did they ultimately purify?
What will be an ideal response?
They used the mutant rad50S cells as their source for protein purification. This mutant was blocked in recombination repair such that covalently linked intermediates accumulate. The protein they eventually identified was Spo11.
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While walking a cornfield, you notice roots emerging from the corn stalks themselves, and you suspect that these roots are helping to hold the plants upright. These roots belong to a category of roots known as
A) Taproots B) Fibrous roots C) Adventitious roots D) Root hairs E) Special roots
Your brother has just purchased a new plastic model airplane. He places all the parts on the table in approximately the positions in which they will be located when the model is complete. His actions are analogous to which process in development?
A) morphogenesis B) determination C) induction D) differentiation E) pattern formation
The science of describing, naming, and classifying extant and extinct organisms is
A. evolution. B. phylogeny. C. taxonomy. D. nomenclature. E. biology.
Sharks are osmoconformers that maintain osmolarity with the saltwater but keep ion concentrations similar to osmoregulators. To do this they must use non-ions to osmoregulate, such as urea. As such sharks take on excess ions from the water because their bodies are at a significantly lower ion level than saltwater. How are the excess ions eliminated?
A. active transport across the gills B. Rectal gland C. diffusion across the gills D. None of the answers are correct.