Nitrogen (N) normally forms three covalent bonds with a valence of 5. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of 1). What do you predict to be the charge on ammonium?
A) +1
B) -1
C) +2
D) -2
A
Biology & Microbiology
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You have fractured your bone and your physician is explaining the healing process to you. She tells you that after the blood clot forms, the next step is the development of the callus. Which of the following describes the structure of the callus?
A) spongy bone B) compact bone C) cartilage D) osteoclasts
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Where is phloem sap moved to?
a. to the root system b. to sinks c. to the shoot system d. to sources
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An animal with a simple netlike nervous system is the
A. octopus. B. hydra. C. planarian. D. cat. E. earthworm.
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The location on the medial side of the kidney where the renal artery and vein, renal nerve, and ureter attach to the kidney is the
A. renal fat pad. B. hilum. C. renal sinus. D. renal pelvis. E. renal pyramid.
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