An enzyme functions in a biosynthetic pathway in bacteria. You predict that the product of the reaction may regulate the levels of the protein by
A) binding an aptamer in the RNA leader sequence that alters the conformation to block the ribosome binding site.
B) binding an aptamer in the RNA leader sequence that alters the conformation to expose the ribosome binding site.
C) binding the promoter region to prevent transcription.
D) binding an aptamer in the RNA leader sequence that causes an antiterminator to form.
A) binding an aptamer in the RNA leader sequence that alters the conformation to block the ribosome binding site.
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At least two host races of apple maggots have appeared within the past 150 years, suggesting they may be undergoing
____.
a. parapatric speciation b. allopatric speciation c. sympatric speciation d. genetic drift e. development of a hybrid zone
Which fungal lineage is the oldest?
a. Deuteromycetes b. Chytrids c. Glomeromycetes d. Zygomycetes e. Ascomycetes
A plant with two seed leaves is
a. a monocotyledon. b. a dicotyledon. c. exemplified by corn. d. a dihybrid.
A decline in pH causes the kidneys to increase reabsorption of which substance?
A. Bicarbonate B. Hydrogen ions C. Carbon dioxide D. Carbonic acid E. Phosphates