Scientists think diplomonads and amoeboflagellates are primitive and that their characteristics are similar to those of the first eukaryotic cells. What does this tell you about what the first eukaryotes were like and what kind of environment they might have inhabited?
What will be an ideal response?
Both these organisms are motile, have internal membranes (including a nucleus), and do not have cell wall, characteristics that allow for predation. They lack mitochondria, indicating that they evolved before the O2 content of the air began to rise, and that they split off from the main line before eukaryotes established the symbiotic relationships that led to the evolution of mitochondria.
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Which may be or is an RNA molecule?
A. AGCCTAC B. GGGCCCA C. GCCCUUA D. AGCCTAC AND GGGCCCA E. GGGCCCA AND GCCCUUA
Energy can be redistributed within a collection of matter (called a system) or can be redistributed between the system and its surroundings.
Answer the following statement true (T) or false (F)
Which of the following terms is LEAST related to the other terms?
a) oxygen. b) stomata. c) carbon dioxide. d) transpiration.
When Calvin injected 14C labeled CO2 into cultures of green algae, what result was obtained because the molecule accepting the CO2 was unstable?
A. Radioactivity first appeared in 3-phosphoglycerate. B. Radioactivity first appeared in glucose. C. Radioactivity appeared last in ribulose bisphosphate. D. Radioactivity appeared last in glucose. E. Radioactivity appeared last in 3-phosphoglycerate. F. Radioactivity first appeared in ribulose bisphosphate.