Why is it adaptive for hemoglobin to have decreased oxygen affinity at low pH?
What will be an ideal response?
An active, working tissue makes and uses more ATP and so releases more carbon dioxide during cellular respiration. Because carbon dioxide reacts with water in the blood to form carbonic acid, the presence of high carbon dioxide levels decreases blood pH. Low blood pH decreases the oxygen affinity of local hemoglobin molecules, making it easier for them to unload oxygen to the working tissue.
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Syncretism is characteristic of Buddhism's interaction with which of these ethnic religions?
A. Taoism B. Shintoism C. Confucianism D. all of these E. none of these
What is the approximate mixing time of the ocean?
a. 160 years b. 1,600 years c. 16,000 years d. 1.6 million years
The force driving plate tectonics is ________
A) heat in the deepest layers of the earth B) freezing and thawing of water in the earth's crust C) gravity D) solar radiation E) nuclear reactions in magma
Forests reach their greatest ecological complexity when ________
A) they are frequently burned B) in the early stages of recovering from logging C) they are frequently logged using clear-cutting D) they are mature and exhibit a multi-level canopy E) shrubs and other ground cover plants are absent