Describe the production of urea in the mammalian body. Where is it finally excreted?
What will be an ideal response?
From the metabolism of proteins, amino acids enter the metabolic pathway as acetyl CoA, and the amine portion of the molecule becomes ammonia. In the mammalian liver, ammonia and carbon dioxide (another waste product) form urea. Urea enters the bloodstream, and ultimately is excreted by the kidneys.
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In the study of microbial communities, a new technique, called microelectrodes, is helping us to infer data about microbial activity. Microelectrodes are capable of measuring which of the following data?
A. Measuring pH B. Measuring oxygen and nitrogen tension C. Measuring DNA amounts in the sample D. Measuring electron donors and receptors
Beach erosion is often caused by structures built to prevent erosion.
a. true b. false
A covalent bond is formed when:
A) two atoms share electrons. B) one atom gives up electrons to another atom. C) two nonpolar molecules associate with each other in a polar environment. D) two polar molecules associate with each other in a nonpolar environment. E) a positively charged particle is attracted to negatively charged particle.
The milk plate showed the prescence of _____ while the nutrient gelatin showed the prescence of ______.
Fill in the blank(s) with the appropriate word(s).