Organic molecules are defined as chemical compounds that contain in distinct ratios and structures.
A. carbon and nitrogen
B. carbon and oxygen
C. carbon
D. carbon and hydrogen
E. carbon, hydrogen, and nitrogen
D. carbon and hydrogen
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If the actual results most closely resembled those in part (A) in the figure above, then a further question arising from these data is:
"Do the Dawsonia rhizoids have to be alive to reduce soil nitrogen loss, or do dead rhizoids have the same effect?" Arrange the following steps in the correct sequence to test this hypothesis. 1. Add metabolic poison to the soil of the experimental plot of mosses. 2. Apply water equally to the experimental and control plots. 3. Measure initial soil nitrogen contents of control and experimental plots. 4. Determine nitrogen loss from soil of control and experimental plots. 5. Establish two identical plots of Dawsonia mosses; one as a control, the other as the experimental treatment. A) 5 ? 1 ? 3 ? 2 ? 4 B) 5 ? 2 ? 3 ?? 1 ? 4 C) 5 ? 3 ? 1 ?? 2 ? 4 D) 4 ? 5 ? 1 ? 3 ?? 2 E) 5 ? 3 ? 2 ?? 1 ? 4
In the cell cycle, the G1 phase represents ____
a. the stage of DNA synthesis b. splitting of the chromosomes into chromatids c. a period of growth d. the stage of actual cell division e. the stage just prior to meiosis
In which stage of labor is the afterbirth (placenta, fluid, and blood) delivered?
a. the first stage b. the second stage c. the third stage d. in either the first or second stage e. in either the second or third stage
________ is the process of the transmission of characteristics from parent to offspring.
A. Movement B. Heredity C. Complexity D. Physiology E. Homeostasis