In what way does hemoglobin act as a buffer against changes in blood pH?
A) Subsequent binding of oxygen is drastically reduced after the first one is bound.
B) Hemoglobin binds some of the excess protons released by carbonic acid.
C) Hemoglobin produces protons or hydroxide ions as needed to alter the blood pH.
D) Hemoglobin removes excess protons from the red blood cells so that they can be excreted through the kidneys.
Answer: B
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Answer the question using the accompanying figure.Which structure vibrates and bends the sensory hairs?
a. 1 b. 2 c. 3 d. 4 e. 5
Which statement is true?
a. Morphology no longer informs phylogenetic classification. b. Cnidarians are the only organisms classified as Radiata. c. Phylogenetic trees are hypotheses, and frequently change. d. Mitochondrial DNA is only used to classify extinct organisms.
All human cells carry
a. one X and one Y chromosome b. at least one X chromosome c. at least one Y chromosome d. a pair of X chromosomes
A ________ is a type of major land ecosystem determined mostly by the features of the climate in the area. Many are actually named for the dominant plants or lack of.
A. community B. land formation C. biome D. biosphere