How do soil conditions impact the cycling of nitrogen during decomposition?
What will be an ideal response?
Soil moisture content influences cycling of nitrogen. In moist soil, the ammonia generated by decomposition of amino acids is converted to ammonium ion and quickly absorbed by organisms. In dry soil the ammonia is lost to the atmosphere.
The pH of the soil also influences whether ammonia is lost to the atmosphere or not: alkaline soil allows ammonia to escape as a gas, while neutral to acidic conditions favor conversion to ammonium ion and retention.
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An decrease from pH 7.4 to pH 7.2 causes hemoglobin to _____
A) release all bound carbon dioxide molecules B) bind more oxygen molecules C) denature D) increase its binding of H+ E) give up more of its oxygen molecules
What is the main difference between plant defense mechanisms that use secondary chemical metabolites versus plant defense mechanisms that use a systemic response?
A. The metabolites are not as lethal as the systemic response. B. The metabolites are present at all times, and the systemic response must be induced. C. The metabolites can only help in defense against insects, not against other plants. D. The metabolites are toxic to the plants that produce them, the systemic response is safer. E. The metabolites are a more reliable way to kill the invader.
Up until the late eighteenth and early nineteenth centuries, many naturalists believed that all species of living organism(s) had been created separately and had remained unchanged since the creation. Around that time, scientific research provided findings that were contradictory to that idea. All of the following are findings that contradict the idea of a single creation. Choose the exception
a. As scientists explored more of the earth, they found that different groups of organisms were found in the different regions. b. Even though the limbs of various mammals carry out different functions (swimming, gliding, running, holding, etc.), the bone patterns are very similar. c. Some fossils of extinct organisms are quite different from living organisms. d. The limbs of some mammals serve the same purpose but their bone patterns are very different. e. The platypus is only found in Australia and the dodo was only found on Madagascar.
The human axial skeleton includes all of the following EXCEPT the
a. skull. b. ribs. c. pectoral girdle. d. sternum. e. vertebral column.