Which of the following is NOT a concept or term related to the flow of energy through living systems?
a. cellular respiration
b. consumers
c. decomposers
d. photosynthesis
e. sexual reproduction
E
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Select the most complete explanation of what the pH scale measures.
A. The acidity of a solvent B. The alkalinity of a solvent C. The concentration of buffers in a solution D. The concentration of hydrogen ions in a solution
Which of the following statements about essential elements is FALSE?
a. An element with only one role in plant metabolism may still be essential. b. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant. d. An essential element may occasionally be functionally replaced by another element. e. Some essential elements are required in only trace amounts.
During orgasm, which of the following stimulate a
feeling of pleasure? a. LH b. endorphins c. testosterone d. oxytocin e. all of these
Which functional group is most prevalent in carbohydrates?
A. Sulfhydrl B. Amino C. Hydroxyl D. Phosphate E. Benzene