What is the most general and important effect of the evolution of cyanobacteria, photosynthetic
“protists” and plants?
What will be an ideal response?
Together these organisms provide the nutritional foundation for nearly all communities of life. As each
group radiated, they, through both photosynthesis and mass, provided for the evolution of animals.
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What is common to all of the oxidation reactions in the Krebs cycle?
A. They all lead to the generation of NADH. B. They are all decarboxylation reactions. C. They are all characterized by a loss of electrons from an organic molecule coupled to the reduction of an electron acceptor. D. They all lead to substrate-level phosphorylation of ADP to generate ATP.
Which of the following is NOT an example of negative feedback control of homeostasis?
a. childbirth. b. blood pH regulation. c. regulation of heart rate. d. temperature regulation. e. blood oxygen regulation.
Why are people with blood type O called "universal donors", while people with blood type AB called "universal recipients"?
What will be an ideal response?
The oldest prokaryotic fossils have been dated to:
a. 1 billion years ago. b. 2 billion years ago. c. 4.6 billion years ago. d. 3.5 billion years ago. e. 2.5 billion years ago.