In plants, peroxisomes associated with nitrogen fixation in legumes can be found in great abundance in
A) leaves.
B) stems.
C) phloem and xylem.
D) cotyledons.
E) root nodules.
E) root nodules.
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Which antibodies cross the placenta and protect the fetus?
A. IgA B. IgG C. IgM D. IgD
When gibberellin binds to its receptor, what happens to activate the gibberellin-dependent transcription factor GA-TRXN?
A. Ethylene is released. B. A ubiquitin tag is used to degrade the GA-TRXN inhibitor. C. A DELLA protein is degraded, freeing the GA-TRXN. D. A DELLA protein is attached to GA-TRXN to activate it. E. The gibberellin is transferred to an alternate binding site.
As compared to the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of
A. a four-chambered heart. B. complete separation between oxygenated and deoxygenated blood. C. partially-separate circuits for gas exchange and systemic delivery of blood. D. a pocket of the gut that serves as an air bladder. E. a single circuit.
The pectoral girdle and the pelvic girdle differ in that ____
a. the pectoral girdle has more bones b. the pectoral girdle includes the patella and the pelvic girdle includes the radius c. the bones of the pelvic girdle are fused while the bones of the pectoral girdle are not d. the bones of the pelvic girdle are part of the upper body while the bones of the pectoral girdle are a part of the lower body e. the bones of the pelvic girdle contain more calcium