Fungi, together with bacteria, are the principal _________ in the biosphere.
Fill in the blank(s) with the appropriate word(s).
Decomposers
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Stomata close when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
Where in the body does the circadian clock act to control of vascular disease?
a. Systems under positive feedback control. b. Systems under negative feedback control. c. Systems that develop early in life. d. Systems that develop later in life. e. It is not known.
Which of the following statements is true of proteins?
a. Proteins lose some or all of their normal activity if their three-dimensional structure is disrupted. b. Proteins are composed of ribose, phosphate, and a nitrogen-containing base. c. The activity of proteins is independent of temperature and pH. d. Denaturation is usually reversible. e. All proteins are enzymes.
Atmospheric sulfur dioxide returns to Earth in rain as weak sulfuric acid
Indicate whether the statement is true or false