The splitting of water produces three products. Name and discuss the role of each
What will be an ideal response?
ANSWER: First, an electron is liberated. This electron is excited by photosystem II and passed through
the noncyclic pathway of photosynthesis. Second, hydrogen ions are generated, and these
contribute to the high density of hydrogen ions in the thylakoid compartment. Last, oxygen
is produced. This is a waste product to the photosynthetic organism but is responsible for the
oxygen-rich environment today.
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Which of the following chemicals has the LEAST influence on the regulation of breathing rate?
a. O2. b. CO2. c. H+. d. N2. e. CO.
Research has shown that commercial fisheries place selective pressure on fish populations by
harvesting mostly the ____ fish, resulting in ____.
a. young; aging populations b. larger; maturity at smaller sizes c. smaller; maturity at larger sizes d. prereproductive; declining birth rates e. postreproductive; no change in population size
Platelets are large cells that aid in blood clotting
Indicate whether the statement is true or false
Some microorganisms use gaseous nitrogen directly from the atmosphere in a process called
A. denitrification. B. photosynthesis. C. nitrogen fixation. D. nitrogen synthesis.