Why does carbon dioxide dissolved in water act as a buffer?
What will be an ideal response?
The equation below shows what happens when CO2 dissolves in water:
H2O + CO2 ?? H2CO3 ?? H+ + HCO3?
H+ produced when carbonic acid neutralizes excess OH?. If there is excess H+, HCO3? absorbs it to form carbonic acid, and if excess carbonic acid forms, CO2 bubbles out of solution.
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Which of the following statements is true of the bryophyte gametophyte generation?
A. It is diploid. B. It produces spores. C. It is unicellular. D. It is dominant. E. It is dependent on the sporophyte.
When a drop of food coloring is placed in a container of clear water, the colored dye molecules ____
a. undergo osmosis to a different location b. undergo active transport to a different location c. diffuse to the top of the container d. diffuse equally throughout the container e. stay at the bottom of the container
Fatty acids can be metabolized for energy; they enter aerobic respiration ________
a. at the electron transport step as the reduced electron carriers FADH2 and NADH b. at glycolysis, but first must be converted to glucose c. at the Krebs cycle after cleavage and conversion to acetyl-CoA d. in glycolysis after enzymatic conversion to PGAL
The reinforcing substance called lignin provides support to a variety of plant structures, but is located primarily in plant:
a. roots b. stems c. leaves d. vascular tissue e. seeds