Construction of a beaver dam creates a deep pool where fish and aquatic invertebrates can live. The beaver is acting as a(n)
1.Exotic species
2.Indicator species
3.Invasive species
4.Keystone species
4
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Eukaryotes are ________.
A. often made of prokaryotic cells B. always multicellular C. often multicellular, sometimes unicellular D. always unicellular
Meselson and Stahl separated DNA from different generations using:a
density gradient centrifugation. b. gel electrophoresis. c. an electron microscope. d. differential radioisotope labeling. e. None of these
Explain the features necessary for both brown algae and dinoflagellates to be classified in the supergroup SAR.
What will be an ideal response?
How does cyanide poisoning result in the decrease of ATP production?
a. Cyanide permanently oxidizes cytochrome a3, preventing other components to change into the reduced state. This causes the proton gradient to break down, stopping ATP synthesis. b. Cyanide uncouples the proton gradient from the process of ATP synthesis. c. Cyanide permanently reduces cytochrome a3, preventing other components to change into the oxidized state. This causes the proton gradient to break down, stopping ATP synthesis. d. Cyanide permanently binds to oxygen, preventing its use as the final electron acceptor.