How is the rho protein triggered in rho-dependent termination of prokaryotic transcription?
a. Rho protein encounters a region rich in C-G nucleotides and a stable hairpin forms.
b. Rho protein is triggered by the ?’ subunit of polymerase.
c. A run of G nucleotides will stall polymerase and rho protein collides with it from behind.
d. Upstream nucleotides in a pattern of TATAAT triggers the rho protein to bring polymerase to a halt.
c. A run of G nucleotides will stall polymerase and rho protein collides with it from behind.
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Some breeds of dogs that are specialized to retrieve objects from bodies of water have webbing between their toes. A change in what cellular response to positional information during digit formation could account for this morphological feature?
A. Signals that cause differentiation to toes are not received by cells that become webbing. B. Signals to cause apoptosis are not received by cells that become webbing. C. Cells between the future digits migrate, but do not divide once they are in the region that will become toes. D. Cells between the future digits divide, but do not migrate to the region that will become toes. E. Cells between the future digits do not divide before migrating to the region that will become toes.
Evolutionarily, the jaws of vertebrates developed from:
A. the circular mouth of lampreys B. the last pharyngeal arch of jawless fishes C. the third pharyngeal arch of jawless fishes D. the operculum E. the claspers
Toads of the genus Bufo can secrete enough poison to kill a 100 pound dog. What is the source of this
poison? a. epithelial cells b. goblet cells c. endothelial cells d. sweat glands e. oil glands
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for one generation. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy and one half-heavy band B. one heavy and one light band C. one light band D. one half-heavy (intermediate to heavy and light) band E. one heavy band