Which of the following is not true of the site-specific recombination reaction catalyzed by tyrosine-class recombinases?
A. One recombinase subunit becomes covalently linked to the DNA through a phosphotyrosine bond.
B. The overall reaction proceeds with a minimal free-energy change.
C. The overall reaction requires four unique cleavage events.
D. Isomerization of the Holliday intermediates includes branch migration through the core sequence.
E. All of the choices given are true.
C
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Which fungal group produces swimming, flagellated spores?
A) Chytrids B) Glomeromycetes C) Ascomycetes D) Basidiomycetes E) Zygomycetes
The wings of birds and insects are ________ structures.
A. analogous B. molecular C. simple D. homologous E. vestigial
The attenuated oral poliovirus vaccine, (OVP), is no longer administered in the U.S.A. because it
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