Oxygen-hemoglobin dissociation curves at three different pH levels The phenomenon illustrated in Figure 46-4 is known as:
a. carbon dioxide unloading.
b. the Bohr effect.
c. hemoglobin transportation.
d. chloride shift.
e. residual capacity.
B
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World human population in 2009 was approximately
A. 670 million. B. 1.8 billion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
Which of the following statements about protists is true?
a. They are the simplest of eukaryotes. b. They are generally aquatic. c. They are members of a single kingdom d. They are the simplest of eukaryotes, and are generally aquatic e. They are the simplest of eukaryotes, are generally aquatic, and are members of a single kingdom.
An example of a boneless muscular organ is a(n) ____
a. urethra b. tendon c. ligament
d. tongue e. muscle fiber
In the development of a seedling, which of the following will be the last to occur?
A. initiation of the breakdown of the food reserve B. Initiation of cell division in the root meristem C. Emergence of the root D. Expansion and greening of the first true foliage leaves E. Imbibition of water by the seed